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.
Other articles related to "animal, animals":
... In 1997 Nalgene was targeted in a nationwide boycott by campus-based animal rights activists for products used in animal experimentation ... "conducted only within the guidelines of the federal Animal Welfare Act and only when necessary." ...
... Salted-barley corns from the basket were thrown on the animal’s head and into the altar fire ... A lock of hair from the animal is then cut and burned, libation being poured on the altar with prayer ... After silence is proclaimed, the music of flutes begins and the animal is slain ...
... Animal behaviour is the subject of The field of ethology Animal Behaviour, a scientific journal ...
... and African Green Monkeys are widely used in animal testing facilities, either wild-caught or purpose-bred ... Animal rights activists claim that their use is cruel and produces little information of value, and there have been many protests, vandalism to testing facilities and threats to workers ... The topic has become a popular cause for animal rights and animal welfare groups ...
... Animals are regarded by philosophers like Peter Singer as ethical subjects ... Animal rights movements have worked to promote animal welfare ...
Famous quotes containing the word animal:
“O animal excellence,
Take pterodactyl flight
Fire-winged into the air
And find your lair
With cunning sense
On some Arabian bight....”
—Allen Tate (18991979)
“The African race evidently are made to excel in that department which lies between the sensuousness and the intellectualwhat we call the elegant arts. These require rich and abundant animal nature, such as they possess; and if ever they become highly civilised, they will excel in music, dancing and elocution.”
—Harriet Beecher Stowe (18111896)
“Your cravings as a human animal do not become a prayer just because it is God whom you ask to attend to them.”
—Dag Hammarskjöld (19051961)