A Snake with Legs
John Wilkins has written a post discussing the report of a snake with legs. The biological explantion is that genes that normally prevent legs from forming happened to be switched off (I assume this just takes a small mutation), reversing the evolutionary loss of legs that earlier species had.
This is a small example of the kind of thing that contributes to my opinion that the scientific evidence really makes it look like evolution is true (for more on my tentative thoughts on this see my previous post here). The snake legs are such a strange occurence, yet they make perfect sense within the evolutionary framework.