Pygostyle

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pygostyle

[′pīg·ə‚stīl]
(vertebrate zoology)
A specialized bone in birds which is formed by a number of fused tail vertebrae.

Pygostyle

 

in most birds (except ratites and tinamous), a bone formed from four to six concresced posterior caudal vertebrae. The pygostyle, which is a flattened vertical plate, serves to anchor the rectrices forming the tail of the bird.