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
... Nalgene was targeted in a nationwide boycott by campus-based animal rights activists for products used in animal experimentation ... that it supported research "conducted only within the guidelines of the federal Animal Welfare Act and only when necessary." ...
Monkey - Relationship With Humans - In Experiments
... 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 ...
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
... 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 ... The larger animals were killed with a sacrificial axe ...

Famous quotes containing the word animal:

    The animal merely makes a bed, which he warms with his body, in a sheltered place; but man, having discovered fire, boxes up some air in a spacious apartment, and warms that.... Thus he goes a step or two beyond instinct, and saves a little time for the fine arts.
    Henry David Thoreau (1817–1862)

    Man is a wingless animal with two feet and flat nails.
    Plato (c. 427–347 B.C.)

    I am afraid that the animals regard man as a creature like themselves which has lost its sound animal wits in a most dangerous way—that they regard him as the deranged animal, as the laughing animal, as the weeping animal, as the unhappy animal.
    Friedrich Nietzsche (1844–1900)