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Birds are one of the three vertebrate flyer groups.
https://www.researchgate.net/publication/304192129_Flight_feather_attachment_in_rock_pigeons_Columba_livia_Covert_feathers_and_smooth_muscle_coordinate_a_morphing_wing
> Structure
> Structure
The wing of a bird is quite distinguished from that of a bat or of a pterosaur. The "fingers" are not distinctive, and the bone does not reach the wingtip.
Most of the flight loads are carried by the features [1] which are attached to the main bone.
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