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Definition of biography

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So You've Been Asked to Submit a Biography

In a library, the word biography refers both to a kind of book and to a section where books of that kind are found. Each biography tells the story of a real person's life. A biography may be about someone who lived long ago, recently, or even someone who is still living, though in the last case it must necessarily be incomplete. The term autobiography refers to a biography written by the person it's about. Autobiographies are of course also necessarily incomplete.

Sometimes biographies are significantly shorter than a book—something anyone who's been asked to submit a biography for, say, a conference or a community newsletter will be glad to know. Often the word in these contexts is shortened to bio , a term that can be both a synonym of biography and a term for what is actually a biographical sketch: a brief description of a person's life. These kinds of biographies—bios—vary, but many times they are only a few sentences long. Looking at bios that have been used in the same context can be a useful guide in determining what to put in your own.

Examples of biography in a Sentence

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'biography.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

Late Greek biographia , from Greek bi- + -graphia -graphy

1665, in the meaning defined at sense 2

Dictionary Entries Near biography

biographize

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“Biography.” Merriam-Webster.com Dictionary , Merriam-Webster, https://www.merriam-webster.com/dictionary/biography. Accessed 11 Apr. 2024.

Kids Definition

Kids definition of biography, more from merriam-webster on biography.

Nglish: Translation of biography for Spanish Speakers

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Britannica.com: Encyclopedia article about biography

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Animal Biography pp 1–15 Cite as

Introduction: Biographies, Animals and Individuality

• André Krebber 6 &
• Mieke Roscher 6  
• First Online: 20 October 2018

590 Accesses

2 Citations

Part of the book series: Palgrave Studies in Animals and Literature ((PSAAL))

This chapter introduces biographical research within historical, cultural and literary studies as an approach to recovering the individuality of animals. As a genre, biography depends as much on disciplinary and cultural contexts and the willingness to subscribe agency to the biographical subject as on the willingness to accept the constructedness of narratives. The chapter sketches out prior attempts to create animal biographies of individuals as well as groups of animals and presents new theoretical perspectives that promise to be fruitful in generating a view of animals as agents while at the same time problematizing the representational form of the biography. As such, the writing of animal biographies comes into view as an interdisciplinary effort that re-writes animal lives through their shared relationships with humans.

• Prosography
• Subjectivity
• Individuality
• Animal self
• Animal agency
• Pierre Bourdieu

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For example, Baratay, Biographies animales ; DeMello, Speaking ; McHugh, Animal Stories ; Kean, “Balto”; Pycior, “First Dog”; Witz, “Making”; Fudge, “Animal Lives.”

Winkes, “Boukephalas.”

Kean, “Exploration.”

Bingley , Animal Biography (first published in 1802 in 3 volumes, noteworthy as: Animal Biography; or, Authentic Anecdotes of the Lives, Manners and Economy of the Animal Creation, Arranged According to the System of Linnaeus ).

Zymner, “Biographie.”

White, Tropics .

Ferres, “Gender.”

See, for example, Gradmann, “Geschichte.”

For an overview see Hamilton, Biography .

See also Baratay, Biographies animales , 13–20.

Klein and Schnicke, “20. Jahrhundert,” 264.

Bourdieu, “L’illusion biographique.”

Pycior, “Public and Private,” 177–178.

See, for example, Hornung, “Anthropology.”

Schnicke, “Begriffsgeschichte.”

See, for example, Booth, How to Make it .

Davies and Gannon, “Collective Biography.”

Fudge, “Animal Lives.”

DeMello, “Introduction.”

Cf. Klein and Schnicke, “20. Jahrhundert,” 259.

On the last point, see, for example, the discussion of anthropocentrism in Prade, Sprachoffenheit , 35–43.

Woolf, “Art of Biography,” 226–227.

Woolf, Flush .

Works Cited

Baratay, Éric. Biographies animales. Des vies retrouvées . Paris: Seuil, 2017.

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Bingley, William. Animal Biography, or, Popular Zoology: Illustrated by Authentic Anecdotes of the Economy, Habits of Life, Instincts, and Sagacity of the Animal Creation . 4 vols. London: Philips, 1829.

Booth, Alison. How to Make it as a Woman: Collective Biographical History from Victoria to the Present . Chicago: University of Chicago Press, 2004.

Bourdieu, Pierre. “L’illusion biographique”. Actes de la recherche en sciences sociales 62.1 (1986): 69–72.

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Davies, Bronwyn and Susanne Gannon. “Collective Biography and the Entangled Enlivening of Being”. International Review of Qualitative Research 5.4 (2012): 357–377.

DeMello, Margo, ed. Speaking for Animals: Animal Autobiographical Writing . New York: Routledge, 2013.

———. “Introduction”. In Speaking for Animals: Animal Autobiographical Writing , edited by Margo DeMello, 1–14. New York: Routledge, 2013.

Ferres, Kay. “Gender, Biography and the Public Sphere”. In Mapping Lives: The Uses of Biography , edited by Peter France and William St Clair, 303–309. Oxford: Oxford University Press, 2002.

Fudge, Erica. “Animal Lives – Erica Fudge Asks If, and How, a Biography of an Animal Might Be Written.” History Today 54.10 (2004): 21–26.

Gradmann, Christoph. “Geschichte, Fiktion und Erfahrung – kritische Anmerkungen zur neuerlichen Aktualität der historischen Biographie.” Internationales Archiv für Sozialgeschichte der deutschen Literatur (IASL) 17.2 (1992): 1–16.

Hamilton, Nigel. Biography . Cambridge, MA: Harvard University Press, 2009.

Hornung, Alfred. “Anthropology and Life Writing.” In Encyclopedia of Life Writing: Autobiographical and Biographical Form , edited by Margaretta Jolly, 38–41. London: Routledge, 2001.

Kean, Hilda. “Balto, the Alaskan Dog and His Statue in New Yorks Central Park: Animal Representation and National Heritage.” International Journal of Heritage Studies 15.5 (2009): 413–430.

———. “An Exploration of the Sculptures of Greyfriars Bobby, Edinburgh, Scotland, and the Brown Dog, Battersea, South London, England.” Society and Animals 11.4 (2003): 353–373.

Klein, Christian and Falko Schnicke. “20. Jahrhundert.” In Handbuch Biographie: Methoden, Traditionen, Theorien , edited by Christian Klein, 251–264. Stuttgart: Metzler, 2009.

Chapter   Google Scholar  

McHugh, Susan. Animal Stories: Narrating Across Species Lines . Minneapolis: University of Minnesota Press, 2011.

Prade, Juliane. Sprachoffenheit: Mensch, Tier und Kind in der Autobiographie . Königshausen & Neumann Würzburg, 2013.

Pycior, Helena. “The Public and Private Lives of ‘First Dogs’: Warren G. Harding’s Laddie Boy and Franklin D. Roosevelt’s Fala.” In: Beastly Natures: Animals, Humans, and the Study of History , edited by Dorothee Brantz, 176–204. Charlottesville: University of Virginia Press, 2010.

———. “The Making of the ‘First Dog’: President Warren G. Harding and Laddie Boy.” Society and Animals 13.2 (2005): 109–138.

Schnicke, Falko. “Begriffsgeschichte: Biographie und verwandte Termini.” In Handbuch Biographie: Methoden, Traditionen, Theorien , edited by Christian Klein, 1–6. Stuttgart: Metzler, 2009.

White, Hayden V. Tropics of Discourse. Essays in Cultural Criticism . Baltimore: Johns Hopkins University Press, 1978.

Winkes, Rolf. “Boukephalas.” In Miscellanea Mediterranea ( Archaeologia Transatlantica XVIII ), edited by R. Ross Holloway, 101–107. Providence: Joukowsky Institute for Archaeology & the Ancient World, 2000.

Witz, Leslie. “The Making of an Animal Biography: Huberta’s Journey into South African Natural History, 1928–1932.” Kronos 30 (2004): 138–166.

Woolf, Virginia. “The Art of Biography.” In Collected Essays , vol. 4, edited by Leonard Woolf, 221–228. London: Hogarth Press, 1967.

———. Flush: A Biography . London: Hogarth Press, 1933.

Zymner, Rüdiger. “Biographie als Gattung?” In Handbuch Biographie: Methoden, Traditionen, Theorien , edited by Christian Klein, 7–12. Stuttgart: Metzler, 2009.

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Krebber, A., Roscher, M. (2018). Introduction: Biographies, Animals and Individuality. In: Krebber, A., Roscher, M. (eds) Animal Biography. Palgrave Studies in Animals and Literature. Palgrave Macmillan, Cham. https://doi.org/10.1007/978-3-319-98288-5_1

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a written account of another person's life: the biography of Byron by Marchand.

an account in biographical form of an organization, society, theater, animal, etc.

such writings collectively.

the writing of biography as an occupation or field of endeavor.

Origin of biography

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use biography in a sentence

Coltrane, who read theory as well as biographies of the creative (Van Gogh, for instance), might have been pleased to hear that.

Only half way into 2014, historical biographies are already having a banner year.

He expertly weaves multiple strands of information into a smooth narrative studded with mini-biographies.

Peter Guralnick has written biographies of Elvis and Sam Cooke.

Larry Pressler has one of the most intriguing biographies in American politics.

He is celebrated as the editor of Shakspeare, and published several biographies.

Weem's biographies are enjoyable reading rather than accurate accounts of the lives of these individuals.

Individuals today are still writing biographies about military leaders who participated in the War between the States.

Political thinking soon became a favorite topic for written expression and biographies and essays became numerous.

It is used in journals, memoirs, biographies, and many elementary histories.

British Dictionary definitions for biography

/ ( baɪˈɒɡrəfɪ ) /

an account of a person's life by another

such accounts collectively

Derived forms of biography

• biographer , noun
• biographical ( ˌbaɪəˈɡræfɪk ə l ) or archaic biographic , adjective
• biographically , adverb

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Cultural definitions for biography

The story of someone's life. The Life of Samuel Johnson , by James Boswell , and Abraham Lincoln , by Carl Sandburg , are two noted biographies. The story of the writer's own life is an autobiography .

The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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92 Introduction to Animals

While we can easily identify dogs, lizards, fish, spiders, and worms as animals, other animals, such as corals and sponges, might be easily mistaken as plants or some other form of life. Yet scientists have recognized a set of common characteristics shared by all animals, including sponges, jellyfish, sea urchins, and humans.

The kingdom Animalia is a group of multicellular Eukarya. Animal evolution began in the ocean over 600 million years ago, with tiny creatures that probably do not resemble any living organism today. Since then, animals have evolved into a highly diverse kingdom. Although over one million currently living species of animals have been identified, scientists are continually discovering more species. The number of described living animal species is estimated to be about 1.4 million, 1 and there may be as many as 6.8 million.

Understanding and classifying the variety of living species helps us to better understand how to conserve and benefit from this diversity. The animal classification system characterizes animals based on their anatomy, features of embryological development, and genetic makeup. Scientists are faced with the task of classifying animals within a system of taxonomy that reflects their evolutionary history. Additionally, they must identify traits that are common to all animals as well as traits that can be used to distinguish among related groups of animals. However, animals vary in the complexity of their organization and exhibit a huge diversity of body forms, so the classification scheme is constantly changing as new information about species is learned.

• “Number of Living Species in Australia and the World,” A.D. Chapman, Australia Biodiversity Information Services, last modified August 26, 2010, http://www.environment.gov.au/biodiversity/abrs/publications/other/species-numbers/2009/03-exec-summary.html.

Introductory Biology: Evolutionary and Ecological Perspectives Copyright © by Various Authors - See Each Chapter Attribution is licensed under a Creative Commons Attribution 4.0 International License , except where otherwise noted.

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Animal n., plural: animals [ˈænɪməl] Definition: multicellular eukaryotic organisms of the Kingdom Animalia

Table of Contents

Animal Definition

An animal ( plural: animals ) refers to any of the eukaryotic multicellular organisms of the biological kingdom Animalia. Animals of this kingdom are generally characterized to be heterotrophic, motile, having specialized sensory organs, lacking a cell wall , and growing from a blastula during embryonic development. Etymology: Latin animale (neuter of animalis). Synonym: fauna.

Phylum Chordata is an example of a group of animal belonging to Kingdom Animalia. They include snakes, ravens, wolves, horses, dolphins, deer, and humans. Let’s discover more about this fascinating group:  What is phylum chordata? Join our Forum now!

Characteristics of Animals

An animal pertains to any of the eukaryotic multicellular organisms that comprise the biological kingdom of Animalia. Animals possess several characteristics that set them apart from other forms of life. Some of their general characteristics are as follows:

• Animals are multicellular organisms. The animal body is composed of several cells performing specific functions as opposed to bacteria and most protists that are unicellular. The cells may then be organized into various animal tissues, such as epithelial tissues, connective tissues, muscle tissues, nervous tissues, and vascular tissues. The cells in tissues may be held through cell junctions, e.g. tight junctions, gap junctions, and desmosomes.
• The nucleus is the organelle that contains chromosomes that bear genes (DNA).
• Apart from the nucleus, there are other organelles suspended in the cytoplasm of an animal cell, such as the Golgi apparatus , endoplasmic reticulum , lysosomes , and peroxisomes .
• Animal cells lack plastids and cell walls, which are abundant in plant cells, algae , and certain fungi .
• Animal cells have centrosomes that consist of two centrioles. It is involved in the formation of the mitotic spindle, assembly of microtubules , and regulation of cell cycle progression. s considered to be the main microtubule-organizing center (MTOC), regulating cell adhesion, motility, and polarity .

• Animals are heterotrophic . Unlike plants and algae which are autotrophic , the animals depend on another organism for food. Animal carnivores , for instance, are adapted to hunting their prey while others scavenge for animal carcasses or remains. Others feed on plants and as such are referred to as herbivores . Omnivores are animals that feed on both plants and animals. Most animals have an elaborate digestive system in the form of an internal chamber (a digestive tract) that processes ingested food to extract nutrients from it and then releases it from the body in the form of excreta or waste matter. Many animals have a mouth for ingestion and an anus for excretion. Other animals (e.g. Platyhelminthes, cnidarians) have only one opening that serves both as a mouth and an anus. Poriferans, in contrast, lack a digestive system (as well as nervous and circulatory systems).
• Animals are generally motile . They have the capacity to move at will. They can spontaneously and actively move by metabolically utilizing energy (e.g. ATP ) during the process and with the aid of muscles and locomotory structures (e.g. arms, legs, wings, fins, tails, etc.). Animal locomotion refers to the variety of movements that animals use to move from one location to another. Some of these movements are running, walking, jumping, hopping, slithering, swimming, gliding, flying, soaring, and so on. Animals move for multifarious reasons. Some of the reasons animals move are to hunt prey, escape predators, and find a mate or a suitable habitat. There are animals, though, that have become sessile later in life. They become permanently attached to a substrate. Examples are barnacles, sponges , mussels, and corals .
• Animals possess specialized sensory organs such as eyes, ears, nose, skin, and tongue. These sensory organs are vital for use in recognizing and responding to stimuli in the environment . Each of these sense organs contains common and specialized receptors.
• Animals reproduce sexually . They produce a haploid sperm cell (a male sex cell) and a haploid ovum (a female sex cell) that unite at fertilization to form a diploid zygote . Conversely, some animals are capable of asexual reproduction. For instance, some cnidarians produce a genetic clone by budding. Others (e.g. aphids) are capable of parthenogenesis whereby they produce fertile eggs without mating.
• Animals develop from an embryo that passes through a blastula stage. In early embryonic development, a fluid-filled cavity called blastocoel appears within a morula ( i.e. a ball of cells that forms from a series of cell divisions). At this point, the embryo is referred to as a blastula . Cell movement and differentiation start to occur during this stage.
• Animals have a distinctive cell division when a cleavage furrow forms to separate daughter cells. This is in contrast to the plant’s cell plate (phragmoplast) that forms in cell division.
• Animals respire aerobically , taking in oxygen ( inspiration ) and then releasing carbon dioxide ( expiration ). Oxygen is important to cell respiration as it serves as the final electron acceptor in redox reactions during the synthesis of metabolic energy. The different animal structures involved in the exchange of respiratory gases: (1) the skin of tapeworms , earthworms, and leeches , (2) the trachea of insects , (3) the gills of fish , and (4) the lungs of mammals , reptiles, and birds . Amphibians use different respiratory organs at different stages, i.e. gills at the tadpole stage and then skin and lungs at the adult stage.
• With few exceptions, animals possess the following general biological system s : integumentary system , lymphatic system, muscular system , nervous system , reproductive system , respiratory system , skeletal system , and urinary system .

Animal Body Plan

Most animals (at least 99%) have a bilaterally symmetric body plan. When the body is divided by a sagittal plane, the result is having two sides with roughly mirror images, at least morphologically. Most animals are sexually dimorphic, i.e. males and females exhibit different characteristics aside from the differences in their sex organs. For example, males are typically taller and bigger in size than females. In another example, the plumage of birds and the scales of fish are usually more vibrant or colorful in males than in females, which seem to be essential in attracting mates.

In general, animals have the following body systems (as mentioned previously) and each of these systems is made up of organs and tissues . The organs, in turn, are made up of tissues that carry out a particular function. The tissues consist of cells that perform various metabolic activities. There are two major types of cells: somatic cells and sex cells ( i.e. sperm cells and egg cells).

At the cellular level, an animal cell has compartmentalized structures called organelles . The different organelles are mitochondria, Golgi apparatus, endoplasmic reticulum, lysosomes, and peroxisomes. Plastids, which are abundant in a plant or an autotrophic cell, are not present in animal cells. The cell wall is also lacking. Thus, an animal cell in a hypotonic solution will swell and eventually burst (lyse) since it lacks the cell wall that prevents lysis during excessive osmosis. The nucleus contains chromosomes that can be classified into two types: autosomes  and sex chromosomes .

The life cycles in the animal kingdom are diverse. For brevity, the four fundamental stages are infancy » young » adulthood » senescence . All animals undergo these stages in their life cycle. Most mammals have a life cycle that is simple and straightforward. Nevertheless, there are animals whose life cycles are rather complex. Amphibians, like frogs, undergo metamorphosis . Initially, tadpoles live underwater and breathe through the gills.

Over time, they grow into froglets, and soon into adults that live on land and breathe through the lungs. Another example is insects. A gravid female releases eggs. Larva (young) hatches from the egg and goes on to feed. Soon, the larva becomes a pupa, which in turn, metamorphoses into an adult capable of breeding. These animals go through radical transformations. The adult is morphologically far-off from the young.

In animals, the major form of reproduction is by sexual means. Male and female sex cells unite to form a zygote that in time will grow into an animal of their kind. Most animals are diploid . This means that the progeny comes from the union of two sex cells and then grows possessing two sets of chromosomes – one from the male parent and the other from the female parent.

Sex determination is usually genetic. It can be identified based on chromosomal combinations. The different chromosomal systems that determine the sex of the animal are XY , ZW , XO , ZO , UV , and haplodiploidy . In most mammals (including humans), sex determination is based on the XY sex-determination system wherein a female has two X chromosomes and a male has one X chromosome and one Y chromosome .

Some animals are capable of asexual reproduction, e.g. by fragmentation and parthenogenesis . In this case, the animal reproduces a clone . However, asexual reproduction could become an evolutionary disadvantage as it could lead to decreased diversity in the gene pool and the prevalence of harmful recessive traits.

Animals are an important part of the ecological system. They form intricate food webs . They interact with other organisms and form various symbiotic relationships, e.g. mutualism , predation , competition , commensalism , and parasitism . Some animals demonstrate altruistic (self-sacrificing) behavior for the benefit of their conspecifics or colonies.

The animals in the wild help regulate biodiversity as they act as nature’s biological control agents as well as serve as an important source of nutrients for other species. Remains from dead animals serve as food for detritivores . Moreover, the decomposition of the dead animal body enables the return of elements and organic compounds to Earth. Thus, the extinction of an animal species has a major impact on the ecosystem.

In 2011, the Census of Marine Life estimated that there could be around 8.74 million eukaryote species on Earth. Approximately, 7.77 million of them are animal species, and 953, 434 have already been described and cataloged. 1 Unfortunately, there are possibilities that some of the animal species could have become extinct even before they are fully identified and cataloged.

Thus, conservation efforts are being made globally to save the dwindling number of animals, especially those nearing extinction. The International Union for Conservation of Nature’s Red List of Threatened Species, a system of assessing the conservation status of species worldwide, utilized a system of labeling species based on extinction risk. Accordingly, animal species are categorized as: “data deficient”, “least concern”, “near-threatened”, “vulnerable”, “endangered”, “critically endangered”, “regionally extinct”, “extinct in the wild”, and “extinct” . 2

Evolution of Animals

The evolution of life on Earth would lead to the common ancestor, LUCA (last universal common ancestor), presumed to have emerged some 3.5 to 3.8 billion years ago. It is the hypothetical ancestor of all living things, including animals. Here’s a brief timeline of the evolution of animals is shown below:

• Proterozoic eon » Neoproterozoic era » Ediacaran period : Around 600 million years ago , multicellular organisms, referred to as Ediacaran biota , existed based on the first fossils recovered in South Australia. However, the biota disappeared after it flourished for the last 40 million years before the start of the Cambrian. Thus, they are also referred to as the “Pre-Cambrian life”. Called the Ediacaran fauna , these organisms are presumed as the earliest animal forms that resembled the sponges with several morphologies: mud-filled bags ( e.g. Pteridinium ), flattened torus ( e.g. Vendoglossa tuberculata ), “quilted” ( e.g. Charnia , Swartpuntia ), sturdy with spicules ( e.g. Coronacollina acula ). Size ranges from 1cm to less than 1m. 3
• Phanerozoic eon » Paleozoic era » Cambrian period : approximately 541 million years ago , several animals first appeared in the fossil record. Referred to as the Cambrian explosion , it was as if a sudden burst of life occurred during the Cambrian period. Fossils of diverse animals were recovered. One of the most popular Cambrian fossil materials is the Burgess Shale . The fossil assemblage is a 508 million-year-old rock unit that contains diverse animals, such as trilobites, mollusks, echinoderms, brachiopods, Opabinia , Pikaia .Fossil of agnathan (jawless fish) Haikouichthys ercaicunensis was also found and hinted that the agnathans may have been the earliest fish and existed as early as 530 million years ago. Animals are believed to have evolved in the sea, and animal evolution may have started billion years ago or at least long before the Ediacaran period. Eventually, animals ventured onto land, presumably during the Late Cambrian or Early Ordovician. The discovery of the footprint of centipede-like, lobster-sized animals preserved in rocks in southeastern Canada hinted that animals might have ventured ashore about 530 million years ago probably to mate and lay eggs. 4
• Phanerozoic eon » Paleozoic era » Ordovician period : In the Ordovician period ( 485-440 million years ago ), the animals continued to diversify. The fauna was predominated by invertebrates such as trilobites, snails, shellfish, cephalopods, and corals. Primitive fish were also evolving during this period. 3 However, a glaciation event led to the Ordovician-Silurian extinction (one of the deadliest mass extinctions in the history of the Earth).
• Phanerozoic eon » Paleozoic era » Silurian period : In the Silurian period ( 440-415 million years ago ), a mass evolution of fish occurred. The Silurian marine fauna was predominated by jawless (agnathans) and jawed fish. The first freshwater fish first appeared as well. The arthropods, though, remained major predators. Terrestrial animals such as early arachnids and arthropods (together with vascular plants) not just ventured into the land. This time, they colonized it for the first time. Thus, land animals in due course evolved internal gas exchange systems, waterproof external layers, skeletal systems (endo- or exoskeletons), and a form of reproduction that does not involve water. 3
• Phanerozoic eon » Paleozoic era » Devonian period : Devonian period ( 415-360 million years ago ) is referred to as the Age of the Fish . Sharks and agnathans became common during this period. Two lineages, ray-finned and lobe-finned fish, first appeared in fossil records. The fish became the dominant marine vertebrate species. On land, the appearance of primitive plants, trees, and shrub-like forests provided new habitats for arthropods. The first tetrapods to appear were amphibians ( e.g. Ichthyostega ). The land continued to be dominated by arthropods, such as arachnids and wingless insects. However, another major mass extinction occurred. Called the late Devonian extinction, about 70% of species became extinct.
• Phanerozoic eon » Paleozoic era » Carboniferous period : In the Carboniferous period ( 360-300 million years ago ), some of the dominant invertebrates in marine habitats are foraminifera, corals, bryozoan, ostracods, brachiopods, and echinoderms. In freshwater, the dominant invertebrates are bivalve mollusks and crustaceans. As for the dominant vertebrates, fish dominated the aquatic habitats. Major predators include elasmobranchs in the seas and Xenacanthida in freshwater. Arthropods on land continued to evolve. Some of them grew into giants . For example, the millipede-like Arthropleura is regarded as the largest land invertebrate as it could grow to size up to 8.5 ft. The dragonfly-like insect Meganeura , in turn, is the largest flying insect. One of the most important evolutionary milestones was the appearance of tetrapods that lay amniotic eggs. The laying of amniotic eggs in a drier environment allowed tetrapod ancestors of reptiles, birds, and mammals to move farther away from the waterside, and thereby dominate farther inland. Because of this, amniotes diversified greatly by the end of this period.
• Phanerozoic eon » Paleozoic era » Permian period : The Permian period ( 300-250 million years ago ) had one continent called Pangaea surrounded by the Panthalassa ocean, and as such the inlands were very dry and arid. Thus, reptiles and synapsids were the animals that flourished during this period. A major evolutionary transition occurred as the reptile group “Dimetrodon” evolved and gave rise to “beast-faced” therapsids . These reptiles evolved and gave rise to the cynodonts (early ancestors of mammals) towards the end of the period. 3 The first archosaurs (early ancestors of dinosaurs) also appeared in the late Permian period. Another mass extinction event called “the Great Dying” occurred and caused the death of about 90% of life on Earth.
• Phanerozoic eon » Mesozoic era : During this era ( 252 million to 66 million years ago ), the reptiles dominated the land, the seas, and the air. It is referred to as “the Age of the dinosaurs”. Towards the end of the Cretaceous period, a mass extinction occurred and caused the wiping out of the dinosaurs and other large animals ( i.e. >25 kg in weight). This led to the expansion of mammals on land.
• Phanerozoic eon » Cenozoic era : This era called the “new life” is the most recent geological era that spans from 66 million years ago to the present day . The era features the rise of mammals . The great apes evolved and led to the evolution of hominids, which was the evolutionary line that led to the Homo species. The only extant species of the genus Homo is the Homo sapiens (anatomically modern humans).

In 1758, Carl Linnaeus created a biological classification system for animals. In 1874, Ernst Haeckel proposed to divide the animal kingdoms into two groups: the multicellular Metazoa and the single-celled Protozoa . Later, the protozoans were no longer considered animals and have been designated with their own biological kingdom. At present, the kingdom Animalia is comprised of the following extant phyla:

• Acanthocephala (thorny-headed worms)
• Acoelomorpha (acoels)
• Annelida (segmented worms)
• Arthropoda (arthropods)
• Brachiopoda (lamp shells)
• Bryozoa (moss animals, sea mats)
• Chaetognatha (arrow worms)
• Chordata (chordates)
• Cnidaria (coelenterates)
• Ctenophora (comb jellies)
• Echinodermata (echinoderms)
• Entoprocta (goblet worm)
• Gastrotricha (meiofauna)
• Gnathostomulida (jaw worms)
• Hemichordata (acorn worms, pterobranchs)
• Kinorhyncha (mud dragons)
• Loricifera (brush heads)
• Micrognathozoa (tiny jaw animals)
• Mollusca (molluscs)
• Nematoda (nematodes, roundworms)
• Nematomorpha (horsehair worms)
• Nemertea (ribbon worms)
• Onychophora (velvet worms)
• Orthonctida
• Phoronida (horseshoe worms)
• Placozoa (plate animals)
• Platyhelminthes (flatworms)
• Porifera (sponges)
• Rotifera (rotifers)
• Sipuncula (peanut worms)
• Tardigrada (water bears)
• Xenoturbellida

Do you want to know what makes the chordates different from the rest of the animal groups? The answers are in this Forum: What is phylum chordata? Come join us to discover more!

Significance

Animals have long been a key player in the ecosystem and performing an essential role in the lives of other organisms whether from the same kingdom or not. For instance, the carbon dioxide that the animals breathe out is essential to plants and other autotrophs as it is a reactant in the early steps of photosynthesis .

Animals have also a great impact on the lives of humans. Besides as a source of meat, milk, and eggs, animals are also a source of materials ( e.g. wool). Because of this, some of them have been domesticated. Cows, chickens, horses, pigs, sheep, etc. are some of the domesticated animals. There are also animals that are made as pets, e.g. dogs, cats, birds, etc. Some of them are even trained to carry out “jobs”, e.g. guard dogs, rodent-hunting cats, and homing pigeons. Certain animals (e.g. fruit flies, mice, primates) are made to serve as animal models for scientific research.

Animal Trivia

• The largest extant animal on earth is the blue whale ( Balaenoptera musculus ). It could weigh up to 190 metric tonnes and reach up to 110 ft long.
• On land, the largest extant animal is the African bush elephant ( Loxodonta africana ) which could weigh up to 12.25 tonnes and reach up to 35.0 ft long.
• The smallest animal is a cnidarian Myxozoa ( e.g. Myxobolus shekel ) that grows no larger than 20 µm.

Trivia: All vertebrates are chordates but not all chordates are vertebrates! Don’t miss out! Read more here:   What is phylum chordata? Join us for more amazing biology facts!

The branch of science that deals with animals is zoology . The topics are varied. Some of the areas of study are morphoanatomy, histology , physiology , ecology, evolution , taxonomy , and ethology. Specific groups of animals being studied also led to sub-disciplines such as entomology (the study of insects), herpetology (the study of amphibians and reptiles), ornithology (the study of birds), mammalogy (the study of mammals), etc .

Scientific Classification

• Kingdom: Animalia 1758

Try to answer the quiz below to check what you have learned so far about animals.

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• Mora, C., Tittensor, D. P., Adl, S., Simpson, A. G. B., & Worm, B. (2011). How Many Species Are There on Earth and in the Ocean? PLoS Biology , 9(8), e1001127. https://doi.org/10.1371/journal.pbio.1001127
• The IUCN Red List of Threatened Species . (2018, January 1). Retrieved from https://www.iucnredlist.org/
• The History of Animal Evolution . (2000, January 1). Retrieved from https://sci.waikato.ac.nz/evolution/AnimalEvolution.shtml
• Clarke, T. (2002). Oldest fossil footprints on land. Nature News . Retrieved from https://doi.org/doi:10.1038/news020429-2

The taxonomic classification of organisms may change based on new findings.

Recommended Source

• The Society for Experimental Biology (SEB): Animal Biology . Read the latest news on Animal Biology from SEB here

© Biology Online. Content provided and moderated by Biology Online Editors

Last updated on September 20th, 2023

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Definition of 'biography'

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10: Animals

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• Page ID 6669
• 10.1: Animal Characteristics
• 10.2: Animal Classification
• 10.3: Evolution of Animal Behavior
• 10.4: Innate Behavior of Animals
• 10.5: Learned Behavior of Animals
• 10.6: Social Behavior of Animals
• 10.7: Cyclic Behavior of Animals
• 10.8: Reproductive Behavior of Animals

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• This biography offers a few glimpses of his life before he became famous .
• Her biography revealed that she was not as rich as everyone thought .
• The biography was a bit of a rush job .
• The biography is an attempt to uncover the inner man.
• The biography is woven from the many accounts which exist of things she did.
• exercise book
• novelistically
• young adult

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a type of singing in which four, usually male, voices in close combination perform popular romantic songs, especially from the 1920s and 1930s

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Glossary of animal biology terms

• Updated 18/05/22
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A glossary of terms and definitions used in biology and related disciplines such as zoology, zoogeography, palaeontology, animal taxonomy and classification and evolutionary biology.

Native to one area or continent only.

Eutheriansa

A subclass of mammals which give birth to undeveloped young, which are attached to their mother's teat. The teats are generally located in a pouch.

A subclass of mammals which includes the Platypus and Echidnas. They are the only mammals that lay eggs.

Gondwanathe

The ancient southern supercontinent that included Australia, New Guinea, South America, Africa, India and Antarctica.

Pleistocene Epoch

Approximately 2 million - 10,000 years ago.

Pliocene Epoch

Approximately 5 - 2 million years ago.

The Australian Museum respects and acknowledges the Gadigal people as the First Peoples and Traditional Custodians of the land and waterways on which the Museum stands.

Image credit: gadigal yilimung (shield) made by Uncle Charles  Chicka  Madden

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Definition of biography noun from the Oxford Advanced Learner's Dictionary

• Boswell’s biography of Johnson
• a biography by Antonia Fraser
• The book gives potted biographies of all the major painters.
• blockbuster
• unauthorized
• biography by
• biography of

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Other results

• The Dictionary of National Biography
• Dictionary of National Biography

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