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Aestivation ( Latin: aestas (summer); also spelled estivation in American English) is a state of animal dormancy, similar to hibernation, although taking place in the summer rather than the winter. Aestivation is characterized by inactivity and a lowered metabolic rate, that is entered in response to high temperatures and arid conditions. [1]
Hibernation is a state of minimal activity and metabolic depression undergone by some animal species. Hibernation is a seasonal heterothermy characterized by low body-temperature, slow breathing and heart-rate, and low metabolic rate. It is most commonly used to pass through winter months–the so-called overwintering .
Sleep in animals refers to a behavioral and physiological state characterized by altered consciousness, reduced responsiveness to external stimuli, and homeostatic regulation observed in various animals. [citation needed] Sleep has been observed in mammals, birds, reptiles, amphibians, and some fish, [citation needed] and, in some form, in insects and even in simpler animals such as nematodes ...
They do not hibernate, but some species are capable of entering torpor. In winter, many species undergo morphological changes that drastically reduce their body weight.
The following four behavioural criteria are characteristic of sleep in birds and mammals and could be extended to fishes: (1) prolonged inactivity; (2) typical resting posture, often in a typical shelter; (3) alternation with activity in a 24-h cycle; (4) high arousal thresholds. Based on these criteria, many fish species have been observed ...
They have been found in diverse regions of Earth's biosphere – mountaintops, the deep sea, tropical rainforests, and the Antarctic. [8] Tardigrades are among the most resilient animals known, [9] [10] with individual species able to survive extreme conditions – such as exposure to extreme temperatures, extreme pressures (both high and low), air deprivation, radiation, dehydration, and ...
The axolotl ( / ˈæksəlɒtəl / ⓘ; from Classical Nahuatl: āxōlōtl [aːˈʃoːloːtɬ] ⓘ) ( Ambystoma mexicanum) [3] is a paedomorphic salamander closely related to the tiger salamander. [3] [4] [5] It is unusual among amphibians in that it reaches adulthood without undergoing metamorphosis. Instead of taking to the land, adults remain ...
This is a list of nocturnal animals and groups of animals. Birds are listed separately in the list of nocturnal birds .