This unusual amphibian is blind, lives to 100, and goes ten years at a stretch without food. It lives in the subterranean waters of Italy, Croatia and Herzegovenia, where it skeeves out the locals with its strange, human-like skin. Its nickname, in fact, is the “human fish”. Unlike most amphibians, the olm lives in the water for its whole life. Another oddity of the olm: its neotenic (larval) gills.