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Aug 7, 2015 · Take a close look at a house cat's eyes and you'll see pupils that look like vertical slits. But a tiger has round pupils — like humans do. And the eyes of other animals, like goats and...
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As animals have evolved more complex bodies and behaviors, their eyes have also evolved to suit their survival needs. The team at Lasik by OCLI Vision has researched the wondrous variety of animal eyes to create the ultimate guide to how animal eyesight compares to humans.
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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.
Aotus trivirgatus differ from most nocturnal animals by having color vision. This fact, along with the structure of the eye, suggests that the ancestors of the night monkeys were diurnal. Though they have evolved very large eyes for low light conditions their activity is dependent on moonlight and their activity is limited on very dark nights.
The eyes are very large and closely set. The muzzle is unfurred and the ears are quite small. The densely furred tail is nonprehensile. There is a sac below the chin which can be inflated at will and gives resonance to the voice. Aotus are found in forests from sea level to 2,100 meters.
The soulful eyes of the Nancy Ma’s night monkey, also called the Ma’s Night Monkey or Peruvian red-necked owl monkeys, peer from the hollow of trees in the Amazonian neotropics of South America. They make their homes in rainforests that range from Northern Peru to Western Brazil.
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Mar 13, 2024 · The standout feature of these owl monkeys is their unusually large eyes, which evolved in response to a nocturnal lifestyle – they are the only new world monkeys to be active at night.