Animal

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":

Nalgene - Controversy
... 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." ...
Monkey - Relationship With Humans - In Experiments
... 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 ... The topic has become a popular cause for animal rights and animal welfare groups ...
Animal - Ethics
... Animals are regarded by philosophers like Peter Singer as ethical subjects ... Animal rights movements have worked to promote animal welfare ...
Animal Behaviour
... Animal behaviour is the subject of The field of ethology Animal Behaviour, a scientific journal ...
Walter Burkert - Burkert's Theory of Sacrificial Ritual
... 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 ...

Famous quotes containing the word animal:

    The moose will, perhaps, one day become extinct; but how naturally then, when it exists only as a fossil relic, and unseen as that, may the poet or sculptor invent a fabulous animal with similar branching and leafy horns ... to be the inhabitant of such a forest as this!
    Henry David Thoreau (1817–1862)

    The human being is in the most literal sense a political animal, not merely a gregarious animal, but an animal which can individuate itself only in the midst of society.
    Karl Marx (1818–1883)

    Be a good animal, true to your animal instincts.
    —D.H. (David Herbert)