Animals are a major group of organisms, classified as the kingdomAnimalia or Metazoa. In general they are multicellular, capable of locomotion, responsive to their environment, and feed by consuming other organisms. Their body plan becomes fixed as they develop, usually early on in their development as embryos, although some undergo a process of metamorphosis later on.
The word "animal" comes from the Latin word animal, of which animalia is the plural, and ultimately from anima, meaning vital breath or soul.
Characteristics
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 separates them from plants and algae. They are also distinguished from plants, algae, and fungi by lacking cell walls.
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K-9 History: The Dogs of War - History of the military use of dogs, in both war and peace, by many countries. Includes info on Sergeant Stubby and Chips, the most decorated dogs in the US Army.
Meta Description: [ United States' sentry dogs, attack dogs, Military Working Dogs, MWD, patrol dogs, trackers ...from 1775 to the present. ]