Stag Beetle Their bark is worse than their bite. Although the male jaws of a stag beetle can be half of its overall body length, its mostly for show. The real fight is between males of the same type when competing for a suitable dead tree or stump..... Giant Cave Cockroach Unlike most invertebrates, the giant cave cockroach has a lifespan of two years. This is due to the insect's amazing immunity, one that can fight off fungal infections by producing antibodies time and time again. BEAR TAPIR You're not likely to find the endangered bear tapir in the wild. Only 5500 of them remain in the wild making them a pretty rare sight. That is unless you visit the Reid Park Zoo in Tucson, Arizona. Oh, and they like to eat poop.