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Encyclopedia > Crepuscular
Adult "Firefly" or "Lightning Bug" – a Crepuscular Beetle Photuris lucicrescens
Adult "Firefly" or "Lightning Bug" – a Crepuscular Beetle
Photuris lucicrescens

Crepuscular is a term used to describe animals that are primarily active during the twilight. The word derives from the Middle English and French word crepuscule, meaning "twilight". Crepuscular is thus in contrast with diurnal and nocturnal. Crepuscular animals may also be active on a bright moonlit night. Many animals that are casually described as nocturnal are in fact crepuscular. Within the definition of crepuscular are the terms matinal (or "matutinal") and vespertine, denoting animals active in the morning (dawn) and evening (dusk) respectively. Image File history File linksMetadata Download high-resolution version (1600x1200, 351 KB) Other versions DCP_16707. ... Image File history File linksMetadata Download high-resolution version (1600x1200, 351 KB) Other versions DCP_16707. ... Suborders Adephaga Archostemata Myxophaga Polyphaga See subgroups of the order Coleoptera Beetles are the most diverse group of insects. ... Twilight in Denmark, just after sunset Twilight in the midwestern US featuring Venus as a brilliant evening star and the crescent moon Finland - Lapland at midnight in July Twilight in Acapulco with Long time Exposure Early twilight in California, before sunset Twilight is the time before sunrise or after sunset... Middle English is the name given by historical linguistics to the diverse forms of the English language spoken between the Norman invasion of 1066 and the mid-to-late 15th century, when the Chancery Standard, a form of London-based English, began to become widespread, a process aided by the... A diurnal animal (dī-ŭrnəl) is an animal that is active during the daytime and sleeps during the night. ... A bat illustrating nocturnal features. ... Matinal is a term used in the life sciences, apparently only in entomology, where it describes an insect that is only or primarily active in the pre-dawn hours or early morning, and is most often used in literature on the natural history and ecology of bees. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... Dusk in Breaux Bridge, Louisiana, USA. Dusk or civil dusk is the time at which the sun is 6 degrees below the horizon in the evening. ...


The patterns of activity are thought to represent a response to selection from predators. Many predators forage most intensely at night, while others are active at mid-day and see best in full sun. Thus the crepuscular habit may reduce predation. Additionally, in hot areas, it may be a way of avoiding thermal stress while capitalizing on available light.

Short-eared Owl
Short-eared Owl

Crepuscular mammals include the cat, dog, deer, rabbit, chinchilla, ferret, guinea pig, hamster, common mouse, skunk, rat, and capybara. Crepuscular birds include the common nighthawk and spotted crake. Another well known crepuscular animal is the moose, which often comes out in early morning hours or late evening hours. Short-eared Owl from US FWS Source: U.S. Fish & Wildlife Service, Port Louisa NWR File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Short-eared Owl from US FWS Source: U.S. Fish & Wildlife Service, Port Louisa NWR File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Subclasses Subclass Allotheria* Order Docodonta (extinct) Order Multituberculata (extinct) Order Palaeoryctoides (extinct) Order Triconodonta (extinct) Order Volaticotheria (extinct) Subclass Prototheria Order Monotremata Subclass Theria Infraclass Trituberculata (extinct) Infraclass Metatheria Infraclass Eutheria Mammals are a class of vertebrate animals characterized by the production of milk in females for the nourishment of... Binomial name Felis catus Linnaeus, 1758 Synonyms Felis lybica invalid junior synonym The cat (or domestic cat, house cat) is a small carnivorous mammal. ... Trinomial name Canis lupus familiaris The dog (Canis lupus familiaris) is a domestic subspecies of the wolf, a mammal of the Canidae family of the order Carnivora. ... “Fawn” redirects here. ... Genera Pentalagus Bunolagus Nesolagus Romerolagus Brachylagus Sylvilagus Oryctolagus Poelagus Rabbits are small mammals in the family Leporidae of the order Lagomorpha, found in several parts of the world. ... Species Chinchilla lanigera Chinchilla brevicaudata Chinchillas and their relatives, viscachas, are small, crepuscular rodents native to the Andes mountains in South America. ... Trinomial name Mustela putorius furo (Linnaeus, 1758) In general use, a ferret is a domestic ferret (Mustela putorius furo). ... Binomial name Cavia porcellus (Linnaeus, 1758) Guinea pigs (also called cavies) are rodents belonging to the family Caviidae and the genus Cavia, originally indigenous to the Andes. ... This article does not cite any references or sources. ... Feral mouse A mouse (plural mice) is a rodent that belongs to one of numerous species of small mammals. ... Genera Conepatus Mydaus Mephitis Spilogale Skunks are mammals, usually with black-and-white fur, belonging to the family Mephitidae and to the order Carnivora. ... Species 50 species; see text *Several subfamilies of Muroids include animals called rats. ... Binomial name Hydrochoerus hydrochaeris (Linnaeus, 1766) Capybara range The capybara (also capibara), Hydrochoerus hydrochaeris (Water pig) is a semi-aquatic herbivorous animal. ... Binomial name Chordeiles minor (Forster,JR,, 1771) The Common Nighthawk, Chordeiles minor, is a nightjar. ... Binomial name Porzana porzana Linnaeus, 1766 The Spotted Crake (Porzana porzana) is a small waterbird, of the family Rallidae. ... Binomial name Alces alces (Linnaeus, 1758) Moose range map The moose (so named in North America, derived from Eastern Abenaki moz)[1] or elk (in Europe), Alces alces, is the largest member of the deer family Cervidae, distinguished from the others by the palmate antlers of its males. ...


Some species have different habits in the absence of predators. For example, the short-eared owl is diurnal on those of the Galápagos Islands that do not have buzzard species, but crepuscular on the others. This snapping turtle is trying to make a meal of a Canada goose, but the goose is too wary. ... Binomial name Asio flammeus (Pontoppidan, 1763) The Short-eared Owl (Asio flammeus) is a species of typical owl (family Strigidae). ... Orthographic projection centred over the Galápagos. ... A buzzard is one of several large birds, but there are a number of meanings as detailed below. ...


Many moths, beetles, flies, and other insects are crepuscular as well. A moth is an insect closely related to the butterfly. ... Suborders Adephaga Archostemata Myxophaga Polyphaga See subgroups of the order Coleoptera Beetles are the most diverse group of insects. ... Suborders Nematocera (includes Eudiptera) Brachycera Diptera (di - two, ptera - wings), or true flies, is the order of insects possessing only a single pair of wings on the mesothorax; the metathorax bears a pair of drumstick like structures called the halteres, the remnants of the hind wings. ... Orders See taxonomy Insects (Class Insecta) are a major group of arthropods and the most diverse group of animals on the Earth, with over a million described species—more than all other animal groups combined. ...


References

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      Results from FactBites:
     
    Crepuscular - Wikipedia, the free encyclopedia (241 words)
    Crepuscular is a term used to describe animals that are primarily active during the twilight.
    Crepuscular is thus in contrast with diurnal and nocturnal.
    Within the definition of crepuscular are the terms matinal (or "matutinal") and vespertine, denoting animals active in the morning (dawn) and evening (dusk) respectively.
    Crepuscular rays - Wikipedia, the free encyclopedia (321 words)
    Crepuscular rays, in atmospheric optics, also known as sun rays, are rays of sunlight that appear to radiate from a single point in the sky.
    Crepuscular rays are near-parallel, but appear to diverge because of linear perspective.
    Crepuscular rays are usually red or yellow in appearance because the atmosphere acts as a giant lens, refracting low sunset rays into long curved paths passing through up to 40 times as much air than the rays from a high midday sun.
      More results at FactBites »

     
     

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