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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.
There are two noteworthy genera within the New World monkeys that exhibit how different environments with different selective pressures can affect the type of vision in a population. [7] For example, the night monkeys (Aotus) have lost their S photopigments and polymorphic M/L opsin gene. Because these anthropoids are and were nocturnal ...
The Panamanian night monkey is a relatively small monkey, with males weighing approximately 889 grams (31.4 oz) and females weighing about 916 grams (32.3 oz). [6] The fur on the back ranges from grayish brown to reddish brown.
The black-headed night monkey (Aotus nigriceps) is a night monkey species from South America.It is found in Brazil, Bolivia and Peru. [2] The A. nigriceps in Peru were notably inhabiting areas that were degraded, and often these areas were disturbed either by human activities or natural occurrences in the ecosystem. [3]
Night vision is the ability to see in low-light conditions, ... and monkeys, lack a tapetum ... night glasses were the only method of night vision, and thus were ...
Nancy Ma's night monkey (Aotus nancymaae) is a night monkey species from South America. It is found in Brazil and Peru. The species is named after Dr. Nancy Shui-Fong Ma. [3] It is known in medical research as a model organism for studying the Duffy antigen. Nancy Ma's night monkeys have also been found to have an evolutionary pattern change in ...
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All old world monkeys and apes are trichromats, but new world monkeys are polymorphic trichromats, meaning that males and homozygous females are dichromats while heterozygous females are trichromats (with the exceptions of howler monkeys and night monkeys, who have more and less robust color vision respectively).