OCR Text |
Show Bird's Skeleton Most Rigid The skeleton of a bird is the most rigid of all the animals. Bones fuse together and overlap The familiar "wish bone" is simply the two collar bones grown together to give greater strength to the attachment at-tachment of wings. The breastbone is not flat as in most animals, but has an enormoiu ridge down the middle for the attachment of flight muscles. These Riuscles are relatively rela-tively hundreds of '-nes more powerful pow-erful than similar muscles in man. In some birds they are so highly developed that tbey represent half 1 the bird's entire weight |