It is somewhat similar to hibernation. The animals are inactive and have a lowered metabolic rate. The state is entered in response to high temperatures and dry conditions. Lungfish have been doing this since the Devonian period. It takes place during times of heat and dryness, the hot dry season, which is often but not necessarily the summer months. A wide range of animals aestivate, including the Nile crocodile and many snails and lady beetles.
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- from Latin aestas, 'summer'.
- Miller, William Charles (2007). Trace fossils: concepts, problems, prospects. Elsevier. p. 206. ISBN 9780444529497. https://books.google.com/books?id=FLDKUSoFmHMC&pg=PA206.
- Philip Withers, Scott Pedler & Michael Guppy. 1997. Physiological adjustments during aestivation by the Australian land snail Rhagada tescorum (Mollusca: Pulmonata: Camaenidae). Australian Journal of Zoology 45(6) 599 - 611. abstract.
- Hagen K.S. 1962. Biology and ecology of predaceous Coccinellidae. Annual Review of Entomology 7: 289-326