there are see-throughish frogs... there is one almost completely clear, unless I was imagining it, i'll have a look through. Lots of reed frogs are pretty clear also. Maybe it's the level of "see-through-ness" that sets these apart. Interesting though.
Hahahaha this was going to be part of my science fair project, beleive it or not. I saw this article a while ago, theres a vid too, you can see the beating heart and all those little fixin's.
thats cool. at superpet (canadian chain store with better reptile selection than petsmart) they have two albino california kingsnakes or something, and when the snakes climb the glass, you can see their hearts beating. really cool stuff.