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Unlike other New World monkeys, both male and female howler monkeys have trichromatic color vision. [3] This has evolved independently from other New World monkeys due to gene duplication. [4] They have lifespans of 15 to 20 years. Howler species are dimorphic and can also be dichromatic (i.e. Alouatta caraya). Males are typically 1.5 to 2.0 kg ...
The Amazon black howler (Alouatta nigerrima) is a species of howler monkey, a type of New World monkey, endemic to the south-central Amazon in Brazil. [2] Until 2001, most authorities included it as a subspecies (or simply a taxonomically insignificant variation) of the red-handed howler, [3] though its distinction had already been pointed out much earlier. [4]
The red-handed howler (Alouatta belzebul) is a vulnerable species of howler monkey, a type of New World monkey. It is endemic to Brazil , found in the southeastern Amazon and disjunctly in the Atlantic Forest between Rio Grande do Norte and Sergipe .
This strip of land extends northward to Forte Curupá , Brazil, which is the northernmost extent of the distribution of Spix's red-handed howler and also its type locality. [ 2 ] Spix's red-handed howler mainly inhabits lowland forests separated by dry areas as well as forests affected by seasonal flooding.
The black howler (Alouatta caraya) or black-and-gold howler, [2] is among the largest New World monkeys and a member of the Alouatta genus. [ 3 ] [ 4 ] The black howler is distributed in areas of South America such as Paraguay , southern Brazil , eastern Bolivia , northern Argentina , and Uruguay .
A river in the Amazon. Along the Amazon River and many of its tributaries, high annual rainfall that occurs mostly within a rainy season results in extensive seasonal flooding of areas from stream and river discharge. [6] The result is a 10–15 m (33–49 ft) rise in water level, with nutrient rich waters.
At 107 grams (3.8 oz), the spider monkey brain is twice the size of the brain of a howler monkey of equivalent body size; [33] this is thought to be a result of the spider monkeys' complex social system and their frugivorous diets, which consist primarily of ripe fruit from a wide variety (over 150 species) of plants. This requires the monkeys ...
The Atelidae are one of the five families of New World monkeys now recognised. It was formerly included in the family Cebidae. Atelids are generally larger monkeys; the family includes the howler, spider, woolly, and woolly spider monkeys (the latter being the largest of the New World monkeys).