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  2. Oct 22, 2023 · With thousands more domesticated and wild animal lists planned, our goal is to become the most comprehensive and thoroughly researched animal resource on the planet. Scroll down the page to see a complete list of every animal on A-Z Animals!

    • African Civet

      Small animals such as frogs, rodents, lizards, and snakes...

    • African Jacana

      View all 192 animals that start with A. Share on: How to Add...

    • Amazon Tree Boa

      Amazon tree boas are widely kept as pets, but surprisingly...

  3. Explore the latest stories and discoveries about animals from National Geographic. Learn about birds, whales, wolves, orangutans, and more, with stunning photos and videos.

  4. en.wikipedia.org › wiki › AnimalAnimal - Wikipedia

    Over 1.5 million living animal species have been described, of which around 1.05 million are insects, over 85,000 are molluscs, and around 65,000 are vertebrates. It has been estimated there are as many as 7.77 million animal species on Earth. Animal body lengths range from 8.5 μm (0.00033 in) to 33.6 m (110 ft).

    • Overview
    • The animal kingdom
    • GeneratedCaptionsTabForHeroSec

    Animals are multicellular eukaryotes whose cells are bound together by collagen. Animals dominate human conceptions of life on Earth because of their size, diversity, abundance, and mobility. The presence of muscles and mobility is one of the primary characteristics of the animal kingdom.

    What are the two major groups of animals?

    The two major groups of animals are vertebrates and invertebrates. Vertebrates have backbones, and invertebrates do not.

    When did animals first appear?

    Animals first appeared in the Ediacaran Period, about 635 million to 541 million years ago, as soft-bodied forms that left traces of their bodies in shallow-water sediments.

    What are the basic functional systems of animals?

    Animals evolved from unicellular eukaryotes. The presence of a nuclear membrane in eukaryotes permits separation of the two phases of protein synthesis: transcription (copying) of deoxyribonucleic acid (DNA) in the nucleus and translation (decoding) of the message into protein in the cytoplasm. Compared to the structure of the bacterial cell, this ...

    Learn about the kingdom Animalia, which includes all multicellular eukaryotes with muscles and mobility. Explore the diversity, evolution, and behaviour of animals, from sponges to whales, with Britannica.

  5. Explore the diversity and wonder of animals with pictures, videos, facts, news, and more from National Geographic. Discover the latest stories, myths, and mysteries about amphibians, birds, fish, invertebrates, mammals, reptiles, and sharks.

  6. Weird But True: Marine Animals. Penguin facts and photos. Penguin facts and photos

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