Hey creationists!  Tell me again that all mutations are maladaptive!  (really, the mutation itself is not maladaptive, but the problem with these mega-muscled creatures is that they got the mutant gene from BOTH parents.  When one of the pair is the mutant gene, you just have a creature with more muscular potential than most of it's kind.  Having both genes in the pair turn of Myostatin, and you have a creature whose musculature exceeds the capcity of it's body, shortening life-span and leading to reproductive issues.  Sort of like the genes for sickle cell anemia, where one of the pair being mutated leads to resistance to malaria, but having the mutation in both is bad, or from what I've heard,  Hemochromatosis where one mutant gene makes you resistant to anemia, but two is bad)

Learn more about Wendy, the mutent Whippet.

Here is a story about a human child with a mutation that has the same effect in humans (limiting myostatin production).  Researchers hope that this could eventually lead to a treatment for Muscular Dystrophy.

Here's a bunch of Bull. (they refer to it as a cow in the article...but...that's no cow.)

This is the sort of thing that leads to the creationist fallacy that a genetic mutation that can be damaging for a single creature (such as altruism) is proof that evolution is false.  What can be damaging to an individual can actually be beneficial to a population.

(Hat Tip:  Eric, who has no blog)