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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 eyes are disproportionately large, having the largest eye-to-body weight ratio of all mammals. [12] 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.
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 pygmy tarsier (Tarsius pumilus), also known as the mountain tarsier or the lesser spectral tarsier, is a nocturnal primate found in central Sulawesi, Indonesia, in an area with lower vegetative species diversity than the lowland tropical forests. The pygmy tarsier was believed to have become extinct in the early 20th century.
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.
The kinkajou has a round head, large eyes, a short, pointed snout, short limbs, and a long prehensile tail. The total head-and-body length (including the tail) is between 82 and 133 cm (32 and 52 in), and the tail measures 39 to 57 cm (15 to 22 in). [2] Its mature weight ranges from 1.4 to 4.6 kg (3.1 to 10.1 lb).
The eyes are large, even larger than those of nightjars. As in many species of nocturnal birds , they reflect the light of flashlights. [ 14 ] Their eyes, which could be conspicuous to potential predators during the day, have unusual slits in the lids , [ 15 ] which allow potoos to sense movement even when their eyes are closed.