Muscle structure and body size predict the athletic performance of Olympic athletes, such as sprinters. The same, it appears, is true of wild seabirds that can commute hundreds of kilometers a day to ...

A new theory of the origin of birds, traditionally believed to be driven by the evolution of flight, is now being credited to the emergence of enlarged skeletal muscles in birds. Their upright ...

Studies in a group of tropical birds have revealed one of the fastest limb muscles on record for any animal with a backbone. The muscle, which can move the wing at more than twice the speeds required ...