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The blue whale (Balaenoptera musculus) is the largest animal that has ever lived, weighing up to 190 tonnes and measuring up to 33.6 metres (110 ft) long. The largest extant terrestrial animal is the African bush elephant (Loxodonta africana), weighing up to 12.25 tonnes and measuring up to 10.67 metres (35.0 ft) long.
- Overview
- The animal kingdom
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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 organisms with muscles and mobility. Explore the diversity, evolution, and behaviour of animals with Britannica's experts.
Explore the latest stories and photos of animals from National Geographic, covering topics such as conservation, behavior, ecology and more. Learn about the 'virgin birth' stingray, the cicadas invasion, the elephant burial mystery and more.
Explore the diversity and wonder of animals with pictures, videos, facts, news, and more from National Geographic. Discover the Photo Ark project, the latest animal stories, and the best of National Geographic.
May 26, 2023 · Learn about different types of animals, how they are classified, and where they live. Explore animal habitats, endangered species, and animal news on Active Wild.
Explore amazing facts, photos, and videos of your favorite animals with National Geographic Kids. Join the fun and learn more about the natural world.
Animal. For the album, see Animals (album). Animals (or Metazoa) are living creatures with many cells. Animals get their energy from other living things. Usually, they eat them or are parasites. Animals, plants, fungi, and some other living things have complex cells, so they are grouped together as eukaryotes .
