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":

Walter Burkert - Burkert's Theory of Sacrificial Ritual
... 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
... Animal behaviour is the subject of The field of ethology Animal Behaviour, a scientific journal ...
Animal - Ethics
... Animals are regarded by philosophers like Peter Singer as ethical subjects ... Animal rights movements have worked to promote animal welfare ...
Monkey - Relationship With Humans - In Experiments
... 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 ...
Nalgene - Controversy
... In 1997 Nalgene was targeted in a nationwide boycott by campus-based animal rights activists for products used in animal experimentation ... statement that it supported research "conducted only within the guidelines of the federal Animal Welfare Act and only when necessary." ...

Famous quotes containing the word animal:

    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)

    He is blessed who is assured that the animal is dying out in him day by day, and the divine being established.
    Henry David Thoreau (1817–1862)

    When we reflect upon the cruelties daily practised upon such of the animal creation as are given us for food, or which we ensnare for our diversion, we shall be obliged to own that there is more of the savage in human nature than we are aware of.
    Samuel Richardson (1689–1761)