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Oct 22, 2023 · Find your favorite animals from A to Z on this comprehensive and thoroughly researched animal resource. Browse thousands of domesticated and wild animal lists with photos, facts, and videos.
- African Civet
Small animals such as frogs, rodents, lizards, and snakes...
- Aardvark
Heather Hall is a writer at A-Z Animals, where her primary...
- African Jacana
View all 194 animals that start with A. Share on: How to Add...
- Amazon Tree Boa
These snakes fall prey to other carnivores; birds of prey...
- Amargasaurus
Similar Animals to The Amargasaurus. Other Sauropods related...
- African Civet
Had. Animals are multicellular, eukaryotic organisms in the biological kingdom Animalia. With few exceptions, animals consume organic material, breathe oxygen, have myocytes and are able to move, can reproduce sexually, and grow from a hollow sphere of cells, the blastula, during embryonic development.
Explore the fascinating world of animals with National Geographic. Read stories, see photos, and learn about the latest discoveries and conservation efforts for various species.
- Overview
- The animal kingdom
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 ...
Animal Pictures and Facts. Learn all you wanted to know about animals with pictures, videos, facts, news, and more. Composite photograph by Joel Sartore, National Geographic Photo Ark.
Weird But True: Marine Animals. Penguin facts and photos. Penguin facts and photos
Learn about a wide range of animals from A to Z, covering topics such as their diet, habitat, breeding patterns, physical characteristics, personality traits and behaviors. Each animal fact page provides links to more detailed information on each topic. You can also jump to a particular letter by clicking on the A-Z links.