I had an African bullfrog who died just yesterday... I wasn't there when he died, but the way the dirt was arranged near the edge of the tank, he wanted to escape for one reason or another. When I found him, he had his head propped on top of some dry-ish moss and his eyes were sunken in. Even though it was really warm in the tank- and the house- he was colder than ice and he was extremely stiff as if he had been frozen solid. :'( One a year old too...