Dormancy	The state of not being active or growing but being able to become active later.
Cryptobiosis	This state of “suspended animation” has been observed in a variety of invertebrate animals and plants during extreme environmental conditions. It was first described for invertebrate animals that survived an absence of water by becoming inactive and allowing their tissues to become desiccated.
Aestivation	Aestivation is summer dormancy, that is, long-term torpor during the summer for the survival of hot and dry periods.
Hibernation	The state of greatly reduced metabolic activity and lowered body temperature adopted by certain mammals as an adaptation to adverse winter conditions.
Torpor	The state of lowered body temperature and metabolic activity assumed by many animals in response to adverse environmental conditions, especially cold and heat. The torpid state may last overnight, as in temperate-zone hummingbirds and some insects and reptiles; or it may last for months, as in the case of true hibernation and the winter torpor of many cold-blooded vertebrates.
Diapause	Spontaneous interruption of the development of certain animals, marked by a reduction of metabolic activity. It is typical of many insects and mites, a few crustaceans and snails, and perhaps certain other animal groups.