Carpometacarpus

The carpometacarpus is a bone found in the hands of birds.

It is a smallish bone in most birds, generally flattened and with a large hole in the middle.

The alula, by contrast, is formed by the thumb, which does not completely fuse with the other hand-bones.

Likewise, the tipmost primaries attach to the phalanx bones.

Buffalo wings come in two basic sizes, a large angled one containing three major bones, and a smaller flat one containing only two.