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Primates is an order of mammals, which is further divided into the strepsirrhines, which include lemurs, galagos, and lorisids; and the haplorhines, which include tarsiers; and the simians, which include monkeys and apes. Primates arose 85–55 million years ago first from small terrestrial mammals, which adapted for life in tropical forests: many primate characteristics represent adaptations to the challenging environment among tree tops, including large brain sizes, binocular vision, color vision, vocalizations, shoulder girdles allowing a large degree of movement in the upper limbs, and opposable thumbs that enable better grasping and dexterity. Primates range in size from Madame Berthe's mouse lemur, which weighs 30 g (1 oz), to the eastern gorilla, weighing over 200 kg (440 lb). There are 376–524 species of living primates, depending on which classification is used. New primate species continue to be discovered: over 25 species were described in the 2000s, 36 in the 2010s, and six in the 2020s.
Primatology is the scientific study of non-human primates. It is a diverse discipline at the boundary between mammalogy and anthropology, and researchers can be found in academic departments of anatomy, anthropology, biology, medicine, psychology, veterinary sciences and zoology, as well as in animal sanctuaries, biomedical research facilities, museums and zoos. Primatologists study both living and extinct primates in their natural habitats and in laboratories by conducting field studies and experiments in order to understand aspects of their evolution and behavior.
Robin Ian MacDonald Dunbar is a British biological anthropologist, evolutionary psychologist, and specialist in primate behaviour. Dunbar is professor emeritus of evolutionary psychology of the Social and Evolutionary Neuroscience Research Group in the Department of Experimental Psychology at the University of Oxford. He is best known for formulating Dunbar's number, a measurement of the "cognitive limit to the number of individuals with whom any one person can maintain stable relationships".
In the zoological field of ethology, a dominance hierarchy is a type of social hierarchy that arises when members of animal social groups interact, creating a ranking system. A dominant higher-ranking individual is sometimes called an alpha, and a submissive lower-ranking individual is called a beta. Different types of interactions can result in dominance depending on the species, including ritualized displays of aggression or direct physical violence. In social living groups, members are likely to compete for access to limited resources and mating opportunities. Rather than fighting each time they meet, individuals of the same sex establish a relative rank, with higher-ranking individuals often gaining more access to resources and mates. Based on repetitive interactions, a social order is created that is subject to change each time a dominant animal is challenged by a subordinate one.
The yellow baboon is a baboon in the family of Old World monkeys. The species epithet means "dog-head" in Greek, due to the dog-like shape of the muzzle and head. Yellow baboons have slim bodies with long arms and legs along with yellowish-brown hair. They resemble the chacma baboon, but are somewhat smaller and with a less elongated muzzle. Their hairless faces are black, framed with white sideburns. Males can grow to about 84 cm, females to about 60 cm. They have long tails which grow to be nearly as long as their bodies. The average life span of the yellow baboon in the wild is roughly 15–20 years; some may live up to 30 years.
The chacma baboon, also known as the Cape baboon, is, like all other baboons, from the Old World monkey family. It is one of the largest of all monkeys. Located primarily in southern Africa, the chacma baboon has a wide variety of social behaviours, including a dominance hierarchy, collective foraging, adoption of young by females, and friendship pairings. These behaviors form parts of a complex evolutionary ecology. In general, the species is not threatened, but human population pressure has increased contact between humans and baboons. Hunting, trapping, and accidents kill or remove many baboons from the wild, thereby reducing baboon numbers and disrupting their social structure.
Social grooming is a behavior in which social animals, including humans, clean or maintain one another's bodies or appearances. A related term, allogrooming, indicates social grooming between members of the same species. Grooming is a major social activity and a means by which animals who live in close proximity may bond, reinforce social structures and family links, and build companionship. Social grooming is also used as a means of conflict resolution, maternal behavior, and reconciliation in some species. Mutual grooming typically describes the act of grooming between two individuals, often as a part of social grooming, pair bonding, or a precoital activity.
Monogamous pairing in animals refers to the natural history of mating systems in which species pair bond to raise offspring. This is associated, usually implicitly, with sexual monogamy.
Reproductive suppression is the prevention or inhibition of reproduction in otherwise healthy adult individuals. It occurs in birds, mammals, and social insects. It is sometimes accompanied by cooperative breeding. It is maintained by behavioral mechanisms such as aggression, and physiological mechanisms such as pheromone signalling. In evolutionary terms, it may be explained by the theory of inclusive fitness.
Sexual selection in humans concerns the concept of sexual selection, introduced by Charles Darwin as an element of his theory of natural selection, as it affects humans. Sexual selection is a biological way one sex chooses a mate for the best reproductive success. Most compete with others of the same sex for the best mate to contribute their genome for future generations. This has shaped human evolution for many years, but reasons why humans choose their mates are not fully understood. Sexual selection is quite different in non-human animals than humans as they feel more of the evolutionary pressures to reproduce and can easily reject a mate. The role of sexual selection in human evolution has not been firmly established although neoteny has been cited as being caused by human sexual selection. It has been suggested that sexual selection played a part in the evolution of the anatomically modern human brain, i.e. the structures responsible for social intelligence underwent positive selection as a sexual ornamentation to be used in courtship rather than for survival itself, and that it has developed in ways outlined by Ronald Fisher in the Fisherian runaway model. Fisher also stated that the development of sexual selection was "more favourable" in humans.
Baboons are primates comprising the genus Papio, one of the 23 genera of Old World monkeys, in the family Cercopithecidae. There are six species of baboon: the hamadryas baboon, the Guinea baboon, the olive baboon, the yellow baboon, the Kinda baboon and the chacma baboon. Each species is native to one of six areas of Africa and the hamadryas baboon is also native to part of the Arabian Peninsula. Baboons are among the largest non-hominoid primates and have existed for at least two million years.
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. Thought to be an honest signal of fertility, male primates are attracted to these swellings; preferring, and competing for, females with the largest swellings.
In biology, paternal care is parental investment provided by a male to his own offspring. It is a complex social behaviour in vertebrates associated with animal mating systems, life history traits, and ecology. Paternal care may be provided in concert with the mother or, more rarely, by the male alone.
Jeanne Altmann, born March 18, 1940, in New York City, is a professor emerita and Eugene Higgins Professor of ecology and evolutionary biology currently at Princeton University. She is known for her research on the social behaviour of baboons and her contributions to contemporary primate behavioural ecology. She is a founder and co-director of the Amboseli Baboon Research Project. Her paper in 1974 on the observational study of behaviour is a cornerstone for ecologists and has been cited more than 10,000 times. She is a Fellow of the National Academy of Sciences, and a member of the American Philosophical Society (2020)
Susan C. Alberts is an American primatologist, anthropologist, and biologist who is the current Chair of the Department of Evolutionary Anthropology at Duke University; previously, she served as a Bass fellow and the Robert F. Durden Professor of Biology at Duke. She currently co-directs the Amboseli Baboon Research Project with Jeanne Altmann of Princeton University. Her research broadly studies how animal behavior evolved in mammals, with a specific focus on the social behavior, demography, and genetics of the yellow baboon, although some of her work has included the African elephant. She was elected a fellow of the American Academy of Arts and Sciences in 2014, won the Cozzarelli Prize of the National Academy of Sciences in 2016, and was elected a fellow of the National Academy of Sciences in 2019.
Endocrinology of parenting has been the subject of considerable study with focus both on human females and males and on females and males of other mammalian species. Parenting as an adaptive problem in mammals involves specific endocrine signals that were naturally selected to respond to infant cues and environmental inputs. Infants across species produce a number of cues to inform caregivers of their needs. These include visual cues, like facial characteristics, or in some species smiling, auditory cues, such as vocalizations, olfactory cues, and tactile stimulation. A commonly mentioned hormone in parenting is oxytocin, however many other hormones relay key information that results in variations in behavior. These include estrogen, progesterone, prolactin, cortisol, and testosterone. While hormones are not necessary for the expression of maternal behavior, they may influence it.
Extended female sexuality is where the female of a species mates despite being infertile. In most species, the female only engages in copulation when she is fertile. However, extended sexuality has been documented in Old World primates, pair bonded birds and some insects. Extended sexuality is most prominent in human females who exhibit no change in copulation rate across the ovarian cycle.
Infanticide in non-human primates occurs when an individual kills its own or another individual's dependent young. Five hypotheses have been proposed to explain infanticide in non-human primates: exploitation, resource competition, parental manipulation, sexual selection, and social pathology.
Dorothy Leavitt Cheney was an American scientist who studied the social behavior, communication, and cognition of wild primates in their natural habitat. She was Professor of Biology at the University of Pennsylvania and a member of both the US National Academy of Sciences and the American Academy of Arts and Sciences.
Jenny Tung is an evolutionary anthropologist and geneticist. She is Director of the Department of Primate Behavior and Evolution at the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, and a Visiting Professor of Evolutionary Anthropology and Biology at Duke University. In 2019, she was awarded a MacArthur Fellowship., and in 2024, she was elected a member of the United States National Academy of Sciences. Tung co-directs the Amboseli Baboon Research Project, a long-term study of wild baboons in Kenya.
References
- ↑ "Amboseli Baboon Research Project".
- ↑ "SourceCode". Babase Wiki. Retrieved 5 May 2015.
- ↑ Altmann, J.B.; Alberts, S.C.; Altmann, J (2003). "Social bonds of female baboons enhance infant survival". Science. 302 (5648): 1231–1234. Bibcode:2003Sci...302.1231S. doi:10.1126/science.1088580. PMID 14615543. S2CID 24970809.
- ↑ Charpentier, M; VanHorn, R.C.; Altmann, J.; Alberts, S.C. (2008). "Paternal effects on offspring fitness in a multi-male primate society". Proceedings of the National Academy of Sciences. 105 (6): 1988–1992. Bibcode:2008PNAS..105.1988C. doi: 10.1073/pnas.0711219105 . PMC 2538869 . PMID 18250308.
- ↑ Onyango, P.O.; Gesquiere, L.; Wango, E.O.; Alberts, S.C.; Altmann, J. (2008). "Persistence of maternal effects in baboons: mother's dominance rank at son's conception predicts stress hormone levels in sub-adult males". Hormones and Behavior. 54 (319–324): 319–324. doi:10.1016/j.yhbeh.2008.03.002. PMC 2586325 . PMID 18448106.
- ↑ Altmann, J.C.; Alberts, S.C.; Silk, J.B.; Altmann, J. (2003). "True paternal care in a multi-male primate society". Nature. 425 (6954): 179–181. Bibcode:2003Natur.425..179B. doi:10.1038/nature01866. PMID 12968180. S2CID 1348221.
- ↑ Gesquiere, L.R.; Learn, N.H.; Simao, C.M.; Onyango, P.O.; Alberts, S.C.; Altmann, J. (2011). "Life at the top: rank and stress in wild male baboons". Science. 333 (6040): 357–360. Bibcode:2011Sci...333..357G. doi:10.1126/science.1207120. PMC 3433837 . PMID 21764751.