From MSNBC:
Scientists at Hiroshima University have succeeded in breeding see-through frogs — an innovation that could cut down on future dissections. Transparent fishes have been around for a long time, but Professor Masayuki Sumida said the new line of frogs were the world’s first transparent four-legged animals.
Sumida, an amphibian specialist who led the university’s research team, said the transparent-skinned frogs could become widely used in scientific research because internal organs and blood vessels can be observed without dissecting the creatures.
More here.