KAIJU (怪獣, kaijū) n. Japanese word loosely translated as "strange beast". Often used in English to mean "monster".
Gamera. One giant turtle, no argument here. First flew on Tokyo movie screens in 1965 after being woken up, Gojira-style, from an atomic test blast. He's got teeth, he's got tusks, he can walk on two legs or four legs, and he can breathe fire. You'll never make turtle soup outta this guy!