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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 ...
Fish do sleep, according to the criteria for behavioural sleep. [2] As fish are a hugely diverse taxon, with over 30,000 described species of fish, the sleep behaviours and characteristics differ between species. For a long time, researchers overlooked sleep behaviour in fish and other ecothermic taxa, [3] as the definition of sleep included ...
Cats conserve energy by sleeping more than most animals, especially as they grow older. The daily duration of sleep varies, usually between 12 and 16 hours, with 13 to 14 being the average. Some cats can sleep as much as 20 hours. The term "cat nap" for a short rest refers to the cat's tendency to fall asleep (lightly) for a brief period.
As a lifelong cat owner and a vet for more than 13 years, I know first-hand that cats often choose to sleep in the strangest of places, but why does my cat sleep between my legs?
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In cats, the sleep cycle lasts about 30 minutes, though it is about 12 minutes in rats and up to 120 minutes in elephants (In this regard, the ontogeny of the sleep cycle appears proportionate with metabolic processes, which vary in proportion with organism size. However, shorter sleep cycles detected in some elephants complicate this theory).
Generally speaking, cats like to eat fish. In fact, at one point, domestic felines were eating more...
A pregnant Southern platyfish. Pregnancy has been traditionally defined as the period of time eggs are incubated in the body after the egg-sperm union. [1] Although the term often refers to placental mammals, it has also been used in the titles of many international, peer-reviewed, scientific articles on fish.