lungfish

Lungfish aren't that bizarre. Everyone knows they have the ability to breathe air. What is really bizarre is their estivation. Estivation is is a rare state of dormancy similar to hibernation, but during the months of the summer. Animals that estivate spend a summer inactive and insulated against heat to avoid the potentially harmful effects of the season (such as the increase in temperature or relative lack of water), or to avoid contact with other species with which they may otherwise be in competition, or for which they are prey.The lungfish estivates by burying itself in mud formed at the surface of a dried up lake. In this state, the lungfish can survive for many years.Lungfish can be extremely long-lived. The Queensland species lungfish at the Shedd Aquarium in Chicago has been part of the permanent live collection since 1933.