Animal
Animals are a major group of multicellular, eukaryotic organisms of the kingdom Animalia or Metazoa. Their body plan eventually becomes fixed as they develop, although some undergo a process of metamorphosis later on in their life. Most animals are motile, meaning they can move spontaneously and independently. All animals are also heterotrophs, meaning they must ingest other organisms or their products for sustenance.
Most known animal phyla appeared in the fossil record as marine species during the Cambrian explosion, about 542 million years ago.
Read more about Animal: Etymology, Characteristics, Origin and Fossil Record, Model Organisms, History of Classification, Ethics
Famous quotes containing the word animal:
“Come into animal presence.
No man is so guileless as
the serpent. The lonely white
rabbit on the roof is a star
twitching its ears at the rain.”
—Denise Levertov (b. 1923)
“All the lies and evasions by which man has nourished himself—civilization, in a word—are the fruits of the creative artist. It is the creative nature of man which has refused to let him lapse back into that unconscious unity with life which charactizes the animal world from which he made his escape.”
—Henry Miller (1891–1980)
“I’m beginning to think that the proper definition of “Man” is “an animal that writes letters.””
—Lewis Carroll [Charles Lutwidge Dodgson] (1832–1898)