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In zoology, a crepuscular animal is one that is active primarily during the twilight period, [1] being matutinal, vespertine/vespertinal, or both. This is distinguished from diurnal and nocturnal behavior, where an animal is active during the hours of daytime and of night , respectively.
Nightjars are medium-sized nocturnal or crepuscular birds in the family Caprimulgidae / ˌ k æ p r ɪ ˈ m ʌ l dʒ ɪ d iː / and order Caprimulgiformes, characterised by long wings, short legs, and very short bills. They are sometimes called bugeaters, [1] their primary source of food being insects.
The kiwi is a family of nocturnal birds endemic to New Zealand.. While it is difficult to say which came first, nocturnality or diurnality, a hypothesis in evolutionary biology, the nocturnal bottleneck theory, postulates that in the Mesozoic, many ancestors of modern-day mammals evolved nocturnal characteristics in order to avoid contact with the numerous diurnal predators. [3]
Eastern gray squirrels are crepuscular, [24] or more active during the early and late hours of the day, and tend to avoid the heat in the middle of a summer day. [40] They do not hibernate. [41] Eastern gray squirrels can breed twice a year, but younger and less experienced mothers normally have a single litter per year in the spring.
The common nighthawk or bullbat (Chordeiles minor) is a medium-sized [3] [4] crepuscular or nocturnal bird [3] [5] of the Americas within the nightjar (Caprimulgidae) family, whose presence and identity are best revealed by its vocalization.
Tapirs are largely nocturnal and crepuscular, although the smaller mountain tapir of the Andes is generally more active during the day than its congeners. They have monocular vision. Copulation may occur in or out of water. In captivity, mating pairs will often copulate several times during oestrus. [19] [39] Intromission lasts between 10 and ...
A small number of species have tails. Megabats have several adaptations for flight, including rapid oxygen consumption, the ability to sustain heart rates of more than 700 beats per minute, and large lung volumes. Most megabats are nocturnal or crepuscular, although a few species are active during the daytime. During the period of inactivity ...
A study on wildlife ecologists showed that urban cougar populations exist around the Los Angeles metropolitan area, with individuals of these populations having the smallest home ranges recorded for any cougars studied, and being primarily nocturnal and not crepuscular, most likely adaptations to avoid humans in high-density areas. [38]