Reference Terms
from Wikipedia, the free encyclopedia


Animals are a major group of organisms, classified as the kingdom Animalia or Metazoa.

In general they are multicellular, capable of locomotion and responsive to their environment, and feed by consuming other organisms.

Animals have several characteristics that set them apart from other living things.

Animals are eukaryotic and usually multicellular (although see Myxozoa), which separates them from bacteria and most protists.

They are heterotrophic, generally digesting food in an internal chamber, which distinguishes them from plants and algae.

They are also distinguished from plants, algae, and fungi because their cells lack cell walls.

Note:   The above text is excerpted from the Wikipedia article "Animal", which has been released under the GNU Free Documentation License.
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