The structure of a tail is actually much more complex than the structure of a limb or even that of a wing. This is due to the tail having 2 more major components than the tail, the central nervous system and the notochord. The notochord and central nevous system allow the tail to be used to balance a creature and to allow it more movement. Tails contain vertebrae just like a spine, and vertebrae are derived from somites. To me, the tail allowing creatures to balance is interesting, because without it, a T. Rex would just be a clumsy giant, unable to run as fast and often tripping.
Pages 180-200
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