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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 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.
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.
The distinction is not absolute, because crepuscular animals may also be active on a bright moonlit night or on a dull day. Some animals casually described as nocturnal are in fact crepuscular. [2] Special classes of crepuscular behaviour include matutinal, or "matinal", animals active only in the dawn, and vespertine, only in the dusk.
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 ...
The great potoo has a large head in relation to its body. The eyes are also very large with dark brown iris rather than the yellow that many other potoo have [7] and has a short but broad beak. Their wings are elliptical in shape and the tail is elongated. The feather colors vary with white, gray, black, and burgundy.
The eyes can appear as giant black dots with a small yellow ring, or as giant yellow irises with small pupils due to voluntary pupil constriction. [11] The potoo has two or three slits in the eyelid so that it can see when the eyelids are closed; these notches are always open.
Ligeia – name meaning "clear-toned", daughter of Achelous and either Melpomene or Terpsichore; Parthenope – name meaning "maiden-voiced", Daughter of Achelous and Terpsichore; Pisinoe – daughter of Achelous and either Melpomene or Sterope; Thelxinoë – name meaning "mind charming" Swan maiden (Multi-cultural) – shapeshifts from human ...