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
Other articles related to "animal, animals":
... Animal behaviour is the subject of The field of ethology Animal Behaviour, a scientific journal ...
... Macaques, especially the Rhesus Macaque, 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 ...
... 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 ...
... Nalgene was targeted in a nationwide boycott by campus-based animal rights activists for products used in animal experimentation ... only within the guidelines of the federal Animal Welfare Act and only when necessary." ...
Famous quotes containing the word animal:
“Is man no more than this? Consider him well. Thou ow’st the worm no silk, the beast no hide, the sheep no wool, the cat no perfume. Here’s three on’s are sophisticated. Thou art the thing itself; unaccommodated man is no more than such a poor, bare, forked animal as thou art.”
—William Shakespeare (1564–1616)
“The hounding of a dog pursuing a fox or other animal in the horizon may have first suggested the notes of the hunting-horn to alternate with and relieve the lungs of the dog. This natural bugle long resounded in the woods of the ancient world before the horn was invented.”
—Henry David Thoreau (1817–1862)
“Mind and spirit together make up that which separates us from the rest of the animal world, that which enables a man to know the truth and that which enables him to die for the truth.”
—Edith Hamilton (1867–1963)