A monkey is a long-tailed, medium-sized member of the order of Primates. The primate order also includes macaques, baboons, guenons, capuchins, marmosets, and tamarins.Monkeys today are a member of two of the three groups of simian primates, the New World monkeys and the Old World monkeys, of which there are 264 known species. Apes and chimpanzees are not scientifically classified as monkeys, a common misconception due to their physical similarities.Some distinguishing features between New World and Old World monkeys include the tail. Most New World monkeys have prehensile tails while Old World monkeys do not. The facial features of each group of monkeys also differ substantially; however, there are a number of shared features as well.Monkeys are a very diverse family of species, ranging in size from the 5-6 inch Pygmy Marmoset, to the adult male Mandrill, which can be 3 feet tall. Some monkeys spend the majority if their lives in treetops, while others call savannas and grasslands home. Most monkeys survive of a diet of fruit, leaves, nuts, berries, eggs, insects and they occasionally hunt other smaller animals.
Researchers studied chimpanzee and monkey anatomy to better understand how humans evolved to have flexible shoulders and elbows.
The rhesus macaques on Cayo Santiago that engaged in same-sex behavior were also found to have more babies, indicating an evolutionary advantage.
The mother repeatedly tried to catch the dead infant's gaze before throwing the corpse around her enclosure and eventually devouring it.
Researchers reconstructed the evolutionary origins of primate masturbation and found it was an ancestral trait that goes back to the ancestor of all monkeys and apes.
A new, 54-year study suggests coordinated aggression is innate to chimpanzees, and is not linked to human interference.
Friendly associations between gorillas and chimpanzees in the wild can persist for decades, and may originate around food sharing and defense against predators.
Humans and chimps are even more alike than previously thought; chimps learned to make their own tools rather
Long-tailed macaques in Indonesia use stones to masturbate, according to a new study that furthers researchers' understanding of the monkey "sex toy" hypothesis.
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