Show Birds 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 fam wish bone is simply the two collar bones grown together to give greater strength to the thc at at- attachment attachment attachment of wings The breastbone is not flat as in most animals but has an enormous ridge down the middle for the attachment of flight muscles These muscles are rela rela- relatively relatively relatively hundreds of times more pow pow- powerful powerful powerful erful than similar muscles in man map In some birds they are so highly developed that they represent half hail the birds bird's entire weight r |