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The proboscis monkey is a large species, being one of the largest monkey species native to Asia. Only the Tibetan macaque and a few of the gray langurs can rival its size. Sexual dimorphism is pronounced in the species.
Extant primates exhibit a broad range of variation in sexual size dimorphism (SSD), or sexual divergence in body size. [4] It ranges from species such as gibbons and strepsirrhines (including Madagascar's lemurs) in which males and females have almost the same body sizes to species such as chimpanzees and bonobos in which males' body sizes are larger than females' body sizes.
Sexual dimorphism is the condition where sexes of the same species exhibit different morphological characteristics, including characteristics not directly involved in reproduction. [1] The condition occurs in most dioecious species, which consist of most animals and some plants.
Same-sex behavior has been documented in a wide array of animals, including insects, birds, bats and other primates.
Polygynous species include gorillas, Hanuman langurs, geladas, hamadryas baboons, proboscis monkeys, and golden snub-nosed monkeys, and consists of one male mating with multiple females within a harem or one-male unit. Sexual dimorphism tends to be higher in these species and males may also develop prominent secondary sex characteristics. In ...
Popa langurs are small monkeys that only weigh around 15 pounds. They measure 20–23 inches from the head to the base of the tail. Their tails are longer than their bodies at around 31 inches ...
Sexual swelling, sexual skin, or anogenital tumescence refers to localized engorgement of the anus and vulva region of some female primates that vary in size over the course of the menstrual cycle. [ 1 ] [ 2 ] [ 3 ] Thought to be an honest signal of fertility , [ 4 ] male primates are attracted to these swellings; preferring, and competing for ...
Examples of secondary sex characteristics in non-human animals include manes of male lions [4] and long feathers of male peafowl, the tusks of male narwhals, enlarged proboscises in male elephant seals and proboscis monkeys, the bright facial and rump coloration of male mandrills, horns in many goats and antelopes, [10] and the swollen upper ...