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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.
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.
The most noticeable feature of the pygmy tarsier are its large eyes, which are about 16 mm (0.63 in) in diameter. Unlike other nocturnal species, tarsiers lack a tapetum lucidum due to the diurnal evolutionary history of primates. [8] To make up for this, tarsiers have evolved their large eyes to maximize available light. [8]
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]
With its big, round eyes and soft, fluffy fur, this squirrel is irresistibly cute. Its small paws and puffy tail make it look like a living plush toy, while its gliding membrane allows it to ...
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 adapted for night vision and the ears swivel. The sugar glider has a squirrel-like body with a long, partially (weakly) [ 22 ] prehensile tail . The length from the nose to the tip of the tail is about 24–30 cm (9–12 in), and males and females weigh 140 and 115 grams (5 and 4 oz) respectively. [ 23 ]