About Animals Wallpapers
Most known animal phyla appeared in the fossil record as marine species during the Cambrian explosion, about 542 million years ago
Animals are divided into various sub-groups, some of which are: vertebrates (birds, mammals, amphibians, reptiles, fish), molluscs (clams, oysters, octopuses, squid, snails), arthropods (millipedes, centipedes, insects, spiders, scorpions, crabs, lobsters, shrimp), annelids (earthworms, leeches), sponges, and jellyfish
The word "animal" comes from the Latin word animalis, meaning "having breath"
In everyday non-scientific usage the word excludes humans – that is, "animal" is often used to refer only to non-human members of the kingdom Animalia, often, only closer relatives of humans such as mammals, or mammals and other vertebrates, are meant
The biological definition of the word refers to all members of the kingdom Animalia, encompassing creatures as diverse as sponges, jellyfish, insects, and humans
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