Those 5-Legged Frogs? Not Necessarily Caused By Pollution After All

Here's the article on the web site Damn Interesting, which is almost always pretty damned interesting.

http://www.damninteresting.com/?p=575

Here's an original article in Scientific American from 1999.
http://www.sciam.com/article.cfm?articleID=0004B992-1F95-1C75-9B81809EC588EF21

In neither of these do they say this parasite accounts for all the frog mutations, but it's comforting to know that at least some of them (hopefully many or most) are caused by a more natural phenomenon than our pollution.