Monkey is a common name that may refer to groups or species of mammals, in part, the simians of infraorder Simiiformes. The term is applied descriptively to groups of primates, such as families of New World monkeys and Old World monkeys. Wikipedia.

Simians and tarsiers emerged within haplorrhines some 60 million years ago. New World monkeys and catarrhine monkeys emerged within the simians some 35 million years ago. Old World monkeys and Hominoidea emerged within the catarrhine monkeys some 25 million years ago. Extinct basal simians such as Aegyptopithecus or Parapithecus [35-32 million years ago], eosimiidea and sometimes even the Catarrhini group are also considered monkeys by primatologists.[3][4][5][6][7][8][9]

Lemurs, lorises, and galagos are not monkeys; instead they are strepsirrhine primates. Like monkeys, tarsiers are haplorhine primates; however, they are also not monkeys.

Apes emerged within "monkeys" as sister of the Cercopithecidae in the Catarrhini, so cladistically they are monkeys as well. There has been some resistance to directly designate apes (and thus humans) as monkeys despite the scientific evidence, so "Old World monkey" may be taken to mean the Cercopithecoidea or the Catarrhini.[10][11][12][13][14][15][9][16][17] That apes are monkeys was already realized by Georges-Louis Leclerc, Comte de Buffon in the 18th century.[18][19]

Monkeys, including apes, can be distinguished from other primates by having only two pectoral nipples, a pendulous penis, and a lack of sensory whiskers.[20][better source needed]

Phylum: Chordata
Kingdom: Animalia
Lifespan: Mandrill: 20 years, Lion-tailed macaque: 20 years, MORE
Height: Mandrill: 1.8 – 2.1 ft., Japanese macaque: 1.9 ft., Common marmoset: 7.4 in., Olive baboon: 2.3 ft., Golden lion tamarin: 10 in.
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The Panamanian white-faced capuchin, also known as the Panamanian white-headed capuchin