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Humans are normally diurnal creatures that are active in the daytime. As with most other diurnal animals, human activity-rest patterns are endogenously regulated by biological clocks with a circadian (~24-hour) period. [citation needed] Chronotypes have also been investigated in other species, such as fruit flies [3] and mice. [4]
[7] [4] More specifically, geckos, which were thought to be naturally nocturnal have shown many transitions to diurnality, with about 430 species of geckos now showing diurnal activity. [4] With so many diurnal species recorded, comparative analysis studies using newer lineages of gecko species have been done to study the evolution of diurnality.
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 ...
A Young Man Reading by Candlelight, Matthias Stom (ca. 1630). A night owl, evening person, or simply owl, is a person who tends or prefers to be active late at night and into the early morning, and to sleep and wake up later than is considered normal; night owls often work or engage in recreational activities late into the night (in some cases, until around dawn), and sleep until relatively ...
Konstantinos is the name of a practicing occultist and neopagan and the author of seven spiritual and occult books on nocturnal witchcraft, all published by Llewellyn Worldwide. In a 2002 interview [ 1 ] he mentioned additional plans for an Occult Truth series which was to begin with Vampires: The Occult Truth, with the following book being ...
Aye-ayes, being nocturnal, build oval-shaped nests from nearby branches and lianas for day time use. These may be built in a tangle of lianas or in a fork of a tree, at a height of 7 to 20 metres (23 to 66 ft) above the ground. These nests may be re-used by other aye-ayes once the original occupant moves on.
This is because some birds have feathers with certain favourable colourations that can not be distinguished by human vision outside of the UV spectrum. [8] It has been theorized that λ max-shifts might have been required as human ancestors started to switch from leading nocturnal lifestyles to more diurnal lifestyles. This caused their vision ...
The hidebehind is a nocturnal [1] fearsome critter from American folklore that preys upon humans that wander the woods, [2] and was blamed for the disappearances of early loggers when they failed to return to camp. [3] [4] As its name suggests, the hidebehind is said to be able to conceal itself.