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Night monkeys have large eyes which improve their vision at night, while their ears are mostly hidden, giving them their name Aotus, meaning "earless". Night monkeys are the only truly nocturnal monkeys with the exception of some cathemeral populations of Azara's night monkey , who have irregular bursts of activity during day and night.
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.
But unlike many nocturnal animal species, its eyes do not have a tapetum lucidum. Also like other night monkeys, it has a short tail relative to the body size. [7] The Panamanian night monkey is arboreal and nocturnal. [6] It and the other members of the genus Aotus are the only nocturnal monkeys. [9]
These huge eyes provide this nocturnal animal with excellent night vision. [13] In bright light, the tarsier's eyes can constrict until the pupil appears to be only a thin spot. In low light or darkness, the pupil can dilate and fill up almost the entire eye. [14]
The aye-aye is a nocturnal and arboreal animal meaning that it spends most of its life high in the trees. Although they are known to come down to the ground on occasion, aye-ayes sleep, eat, travel and mate in the trees and are most commonly found close to the canopy where there is plenty of cover from the dense foliage.
The “cryptic” animal emerged from its no longer underwater nest and roamed the shore in search of its prey. Nearby scientists spotted the nocturnal animal — and discovered something new.
Tarsiers are small animals with enormous eyes; each eyeball is approximately 16 millimetres (0.63 in) in diameter and is as large as, or in some cases larger than, its entire brain. [ 16 ] [ 17 ] The unique cranial anatomy of the tarsier results from the need to balance their large eyes and heavy head so they are able to wait silently for ...
Their diet is a mixture of insects and other small animals, fruit, and tree gums. [8] They have pectinate (comb-like) incisors called toothcombs, and the dental formula: 2.1.3.3 2.1.3.3 They are active at night. After a gestation period of 110–133 days, young galagos are born with half-closed eyes and are initially unable to move about ...