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Crepuscular, a classification of animals that are active primarily during twilight, making them similar to nocturnal animals. Diurnality, plant or animal behavior characterized by activity during the day and sleeping at night. Cathemeral, a classification of organisms with sporadic and random intervals of activity during the day or night.
Night monkeys have large brown eyes; the size improves their nocturnal vision increasing their ability to be active at night. They are sometimes said to lack a tapetum lucidum, the reflective layer behind the retina possessed by many nocturnal animals. [8] Other sources say they have a tapetum lucidum composed of collagen fibrils. [9]
The spotted-tailed quoll is the largest, with the male weighing about 7 kg (15 lb) and the female 4 kg (8.8 lb). The northern quoll is the smallest, and the male weighs on average 400 to 900 g (14 to 32 oz), and the female 300 to 500 g (11 to 18 oz). [23] Their coats are sandy, brown, or black, with a sparse scattering of white spots.
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The brown greater galago is a nocturnal, arboreal animal. [9] During the day, it rests 5 to 12 meters (16 to 39 ft) above the ground in a dense tangle of creepers or in the hollow of a tree, rarely on an exposed branch. Female galagos will make nests, leafy platforms with foliage above to shelter their young. [7]
The indri (/ ˈ ɪ n d r i / ⓘ; Indri indri), also called the babakoto, [8] is one of the largest living lemurs, with a head-body length of about 64–72 cm (25– 28 + 1 ⁄ 2 in) and a weight of between 6 and 9.5 kg (13 and 21 lb). It has a black and white coat and maintains an upright posture when climbing or clinging.
The spotted hyena is the largest extant member of the Hyaenidae, and is further physically distinguished from other species by its vaguely bear-like build, [5] rounded ears, [6] less prominent mane, spotted pelt, [7] more dual-purposed dentition, [8] fewer nipples, [9] and pseudo-penis.
The megabat family contains the largest bat species, with individuals of some species weighing up to 1.45 kg (3.2 lb) and having wingspans up to 1.7 m (5.6 ft). Not all megabats are large-bodied; nearly a third of all species weigh less than 50 g (1.8 oz).