Estivation and Habituation
Estivation is a lot like Hibernation, differing in one key aspect. While Hibernation is the slowing of an animals metabolism and heart rate in low temperatures, Estivation only occurs in high temperatures. Some examples of animals that exhibit this behavior are Crocodiles, Salamanders, and Lungfish.
Habituation is a very simple behavior. Habituation is the lack of a response to stimuli. For instance, if you call a dog by its name, it may choose to simply ignore you.