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Numerous animal species live in environments characterized by a seasonal reduction in the availability of water, which often but not always occurs when temperatures are highest. For many such animals, survival during the toughest season requires spending long periods of time in a rather inactive state known as aestivation. But aestivation is much more than remaining inactive. Successful aestivation requires the selection of a proper microhabitat, variable degrees of metabolic arrest and responsiveness to external stimuli, the ability to sense the proper time of year for emergence, the...

This first full overview on all aspects of aestivation explores the phenomenon of aestivation from different perspectives and levels of organization. It addresses the topic not only in reptiles, but also in mammals, birds, fish, sponges, insects and fossils.