The aptly named Japanese giant salamander can grow up to five feet long and weigh over 50 pounds. But despite its primitive look, this amphibian is highly evolved. When it detects a threat, it excretes a pungent ooze that smells like a pepper. If left alone, the salamanders can live up to 80 years, but pollution and over-collection are threatening this fascinating creature. This is the Japanese giant salamander.