It's Good to Have Myostatin

Nearly everyone has, at some point, considered the possibility that their body is the way it is because of powers beyond their control. Too thin, too fat, too underdeveloped, too short, too tall...if we can't seem to change it, we tend to assume that there's something else at work.

In the case of muscle development, that something is myostatin. In normal people, it inhibits excessive muscle growth. If you have too little...you get people and animals like you see below. These images come from this fascinating post over on Who-Sucks.com.