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How is hibernation different from estivation?
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Dormancy
Virginia big-eared bats (Corynorhinus townsendii virginianushibernating) are true hibernators, entering a state close to death for much of the winter.
Hibernation and estivation are both forms of dormancyāadaptive states of reduced metabolic activity that allow animals to survive harsh environmental conditions. The primary difference between them is the season and the specific stress they help the animal avoid.123
- Hibernation: This state is adopted by certain animals to survive the adverse conditions of winter, such as extreme cold and food scarcity. During this period, a true hibernator experiences a dramatic drop in body temperature, heart rate, and respiration.14
- Estivation: Often described as a reverse phenomenon to hibernation, estivation occurs in arid regions where animals enter a torpid state to escape the rigors of a hot, dry, and barren summer.13
While both serve as mechanisms to bypass environmental stress, they are triggered by different seasonal challenges. Both states allow organisms to conserve energy and survive in niches that would otherwise be untenable during periods of extreme temperature or resource limitation.32