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Sleep can follow a physiological or behavioral definition. In the physiological sense, sleep is a state characterized by reversible unconsciousness, special brainwave patterns, sporadic eye movement, loss of muscle tone (possibly with some exceptions; see below regarding the sleep of birds and of aquatic mammals), and a compensatory increase following deprivation of the state, this last known ...
Species normally quiescent at night become active day and night during the spawning season. [1] Many parental species forego sleep at night and fan their eggs day and night for many days in a row. This has been observed in threespine stickleback , [ 34 ] convict cichlid and rainbow cichlid , [ 35 ] [ 36 ] various species of damselfish , [ 37 ...
They usually do so when the temperature is warmer and will re-emerge in the late summer or early fall. [5] Mosquitoes also are reported to undergo aestivation. [6] False honey ants are well known for being winter active and aestivate in temperate climates. Bogong moths will aestivate over the summer to avoid the heat and lack of food sources. [7]
The event takes place at night to minimize predation. The rain on the big night keeps the salamanders skin from becoming dry. [1] Amphibians such as salamanders and frogs in a local area usually use the same overwintering area and the same breeding area, returning generation after generation to the area in which they were spawned.
Torpor is a state of decreased physiological activity in an animal, usually marked by a reduced body temperature and metabolic rate.Torpor enables animals to survive periods of reduced food availability. [1]
Northern bat hibernating in Norway Bats hibernating in a silver mine. 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 metaboli
Many ancient fish had lung-like organs, and a few, such as the lungfish and bichir, still do. Some of these ancient "lunged" fish were the ancestors of tetrapods. In most recent fish species, though, these organs evolved into the swim bladders, which help control buoyancy.
Three types of chromatophores are commonly found in amphibians: xanthophores, which contain yellow, orange, or red pigments and are found uppermost on the dermis; iridophores, which lie below the xanthophores and function by reflecting and scattering white light up through them (in the case of Pseudacris regilla and many other North American ...