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Sexual dimorphism in non-human primates

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375:, red facial coloration is attractive to females to the point of influencing the reproductive success of high-ranking males. To be deemed a sexually selected trait said trait must be heritable and confer a reproductive advantage. In this example, facial redness is heritable, but only increases a male's reproductive success if he is also high-ranking, and rank is not determined by facial redness (dominance in rhesus macaques is not competition-based but rather queue-based). While this trait is believed to be the result of intersexual selection, such examples demonstrate the complex nature of determining evolutionary explanations for sexually dimorphic characteristics. 1260: 368:
gestation, lactation, and infant care are all highly energetically costly processes for females, so these energy and time constraints would lead them to choose—when possible—mates with higher quality genes leading to higher quality offspring with a better chance of survival and reproductive success. Importantly, what is deemed “high quality” by the female in this instance need not confer a survival advantage to the male, but must be perceived by females as a sign of attractiveness if not health. A common example of this is sexually dimorphic coloration.
305:), one of the African guenon species, have shown that call rates in adult females (24 call.hr-1) are more than seven times higher than in adult males (2.5call.hr-1). A usage of different call types also differs between sexes, in that females mostly utter contact(-food) calls, whereas males produce a great number of threat calls. Such difference in vocal usage is associated with social roles, with females being involved in more social tasks within the group and males being responsible for territory defense. 336:. Male baboons are known to violently fight and threaten each other over females and show high levels of sexual dimorphism in body and canine size, both of which are assumed to aid in combat. The “winners” of such interactions mate with the desired female and produce offspring, passing their traits to the next generation, while unsuccessful males are excluded from mating. As a result, traits beneficial to fighting are selected for in the population over time. 1804: 20: 31: 262:), males display extensive red and blue coloration on their face, rump and genitalia as compared to females. Male mandrills also possess a yellow beard, nuchal crest of hair, and pronounced boney paranasal ridges, all of which are absent or vestigial in females. Studies have shown that male color in mandrills serves as a badge of social status in the species. 416:) reducing dimorphism. One study offers a challenge to the argument that environmental constraints are the main factor driving monomorphism on Madagascar but fails to isolate specific factors to substitute this theory; simply put, there is no consensus on why strepsirrhines do not follow similar patterns to haplorhines. 379:
mean that even if a male “wins” the opportunity to mate with a female, the father of her infant is not necessarily determined by the outcome of male–male competition, thus limiting the reproductive benefits associated with such competition and dampening the pressure for sexually selected dimorphic traits.
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through group size regulation (by evicting other females). Instances of female–female competition such as this could potentially select for greater body and/or canine size in females, as well as reduce the pressure for those same traits in males by limiting the occurrence of male–male competition (as
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as a group consistently exhibit a low level of sexual size dimorphism for unclear reasons. Gibbons, on the other hand, are an example of monogamous primates that can be described as “monomorphic,” meaning males and females appear the same with little to no sexual dimorphism. The correlation between
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systems among haplorhines show elevated levels of dimorphism. This is expected because polygynous groups, i.e. single-male multi-female, imply males can monopolize females, suggesting male–male competition plays an important role in ensuring any opportunity to reproduce. Without somewhat guaranteed
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Paternity confusion is another component of female choice. By actively seeking out matings with newly immigrated males, females produce offspring whose fathers are unknown. This is beneficial to females because it allows them to sire offspring without the risk of infanticide. These “sneaky matings”
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Primates also exhibit sexual dimorphism in skeletal structures. In general, skeletal dimorphism in primates is primarily known as a product of body mass dimorphism. Hence, males have proportionally larger skeletons compared to females due to their larger body masses. Larger and more robust skeletal
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divergence between the sexes attributes to the evolution of size dimorphism in primates. Males and females are known to have different preferences for ecological habitat due to different reproductive activities, which could possibly lead to dietary differences, followed by dimorphic morphological
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as defined by Darwin and refers to competition within a sex for access to mates. For species where such competition determines their reproductive success, selection pressures for increased strength/size and weaponry/canines are heightened, resulting in the evolution of sexual dimorphism. The most
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can manifest itself in many different forms. In male and female primates there are obvious physical difference such as body size or canine size. Dimorphism can also be seen in skeletal features such as the shape of the pelvis or the robustness of the skeleton. There are two mating systems in the
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primates. It has been hypothesized that larger sizes of body mass and canine tooth are favored among males of terrestrial primates due to the likelihood of higher vulnerability to predators. Another hypothesis suggests that arboreal primates have limitations on their upper body size, given that
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and gibbons the sex differences is on a general average about 4 to 5 percent. In orangutans, males and females share similarities in facial dimensions and growth in terms of orbits, nasal width, and facial width. They tend to have some significant differences, however, in various facial heights
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of females by males. Sexual dimorphism arises via intersexual selection most often through female preference for certain male secondary sexual characteristics, but can also arise as a result of males' selective pressure to physically overpower females he wishes to mate with. Gamete production,
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are sexually dimorphic for different biological characteristics, such as body size, canine tooth size, craniofacial structure, skeletal dimensions, pelage color and markings, and vocalization. However, such sex differences are primarily limited to the anthropoid primates; most of the
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mating system and dimorphism in haplorhines likely indicates sexual selection is the driving force behind dimorphism in species of this suborder. Another more general trend observed in haplorhines is a correlation between body mass dimorphism with overall body size.
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In many adult primates, dimorphism in the vocal repertoire can appear in both call production (e.g., calls with a particular set of acoustic traits) and usage (e.g., call frequency and context-specificity) between the sexes. Sex-specific calls are commonly found in
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structures in males is also attributable to better developed muscle scarring, and more intense cresting of bones compared to those of females. Male gorillas, for example, possess large sagittal and nuchal crests, which correspond to their large
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Larsen, C. S. "Equality for the Sexes in Human Evolution? Early Hominid Sexual Dimorphism and Implications for Mating Systems and Social Behavior." Proceedings of the National Academy of Sciences, vol. 100, no. 16, 2003, pp. 9103–9104.,
121:. Patterns of size dimorphism exhibited in primates may correspond to the intensity of competition between members of the same sex for access to mates–intrasexual competition, counteracted by fecundity selection on the other sex. Some 432:. Such correlation between phylogenetic relatedness and sexual dimorphism across different groups reflects similarities in their behaviors and ecological conditions, but not in independent adaptations. This idea is referred to as “ 278:), males can gain fat as much as 25 percent of the body mass only during the breeding season, specifically in their upper torso, arms, and shoulders. This seasonal phenomenon, known as “male fattening,” is associated with both 153:, the size of male canines is more than twice as large as that of female canines. It is rare, yet females in some species are known to have larger canines than males, such as the eastern brown mouse lemur ( 1320:. Short, R. V. (Roger Valentine), 1930-, Balaban, E. (Evan), International Conference on Comparative Physiology (11th : 1992 : Crans, Switzerland). Cambridge: Cambridge University Press. 1994. 676:. Short, R. V. (Roger Valentine), 1930-, Balaban, E. (Evan), International Conference on Comparative Physiology (11th : 1992 : Crans, Switzerland). Cambridge: Cambridge University Press. 1994. 391:, the degree to which intrasexual and intersexual selection drive sexual dimorphism is dependent on the social organization and mating system of a particular species. Phylogenetic studies reveal 101:
in which males' body sizes are larger than females' body sizes. In extreme cases, males have body sizes that are almost twice as large as those of females, as in some species including
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Dubuc, Constance; Winters, Sandra; Allen, William L.; Brent, Lauren J. N.; Cascio, Julie; Maestripieri, Dario; Ruiz-Lambides, Angelina V.; Widdig, Anja; Higham, James P. (2014-11-07).
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Leigh, Steven R. “Socioecology and the Ontogeny of Sexual Size Dimorphism in Anthropoid Primates.” American Journal of Physical Anthropology, vol. 97, no. 4, 1995, pp. 339–356.,
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primates—a male's lifetime reproductive output is dependent on his ability to outcompete other males and lead a group of females. As an exception, among polygynous primates,
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Dixson, A.; Dixson, B.; Anderson, M. (2005). "Sexual selection and the evolution of visually conspicuous sexually dimorphic traits in male monkeys, apes, and human beings".
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remains a mystery, with some explanations ranging from ecological constraints to selection for speed and agility to unique instances of female social dominance (such as in
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Berge, C.; Penin, X. (2004). "Ontogenetic allometry, heterochrony, and interspecific differences in the skull of African apes, using tridimensional procrustes analysis".
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common illustration of intrasexual selection is male–male competition, in which males of a species fight or threaten each other for preferential access to females.
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than females. Within primates, the male and female canine tooth size varies among different taxonomic subgroups, yet canine dimorphism is most extensively found in
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Sex differences in pelage, such as capes of hair, beards, or crests, and skin can be found in several species among adult primates. Several species (e.g.,
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is often represented by female choice, but more generally refers to differential preferences one sex has for individuals of the opposite sex, including
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Extant primates exhibit a broad range of variation in sexual size dimorphism (SSD), or sexual divergence in body size. It ranges from species such as
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Similar magnitudes of body weight dimorphism have been observed in all species within several taxonomic groups such as callitrichids, hylobatids,
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Among different types of teeth constituting the dentition of primates, canines exhibit the greatest degree of variation in tooth size, whereas
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for larger males. Orangutan males tend to gain weight and develop large cheek flanges, when they achieve dominance over other group members.
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have shown that, in general, males tend to have a greater increase of facial volume than of neurocranial volume, a more obliquely oriented
157:). Sexual dimorphism in canine tooth size is relatively weak or absent in extant strepsirrhine primates. The South American titi monkeys ( 125:
and strepsirrhine primates are, however, characterized by the reverse dimorphism, a phenomenon in which females are larger than males.
1040:"Reproductive success increases with degree of kinship in cooperative coalitions of female red howler monkeys ( Alouatta seniculus )" 313:
Ultimate mechanisms explain the evolutionary history and functional significance of the sexual dimorphism expressed among primates.
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and strepsirrhines (including Madagascar's lemurs) in which males and females have almost the same body sizes to species such as
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Sex differences in the vocal repertoire of adult red-capped mangabeys (Cercocebus torquatus): A multi-level acoustic analysis
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Scaglion, Richard. "On Australopithecine Sexual Dimorphism". Current Anthropology, vol. 19, no. 1, 1978, pp. 153–154.,
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describes the morphological, physiological, and behavioral differences between males and females of the same species. Most
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Craniofacial sex differentiation among anthropoid primates varies in a wide range and is known to arise primarily through
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traits. This niche divergence hypothesis, however, has never been strongly supported due to the lack of compelling data.
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larger body size could disrupt their usage of terminal branches for locomotion. However, among some species of guenons (
206:, orangutans and gorillas are about nine percent larger than the neurocranial dimensions in adult females, whereas in 1325: 1303: 1281: 681: 1274: 1229:
Cardini A, Elton S. 2008. Variation in guenon skulls (II): sexual dimorphism. Journal of Human Evolution 54:638-647.
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group size regulation reduces the likelihood of threats/takeovers by immigrant males), overall reducing dimorphism.
1780: 1595: 1149:"Male morphological traits are heritable but do not predict reproductive success in a sexually-dimorphic primate" 433: 1703: 172:
have the least. A canine dimorphism is also more widely seen in maxillary canines than in mandibular canines.
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Canine sexual dimorphism is one particular type of sexual dimorphism, in which males of a species have larger
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Sexual size dimorphism, canine dimorphism, and male–male competition in primates: where do humans fit in?
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Flores, D.; Casinos, A. (2011). "Cranial ontogeny and sexual dimorphism in two New World monkeys:
198:, and a more pronounced rearrangement of the nuchal region. The breadth, length and height of the 1765: 1000:
Age- and sex-specific patterns of vocal behavior in De Brazza's monkeys (Cercopithecus neglectus)
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The lack of a clear relationship between mating system and intensity of sexual dimorphism in
360: 321: 1092:"Sexually selected skin colour is heritable and related to fecundity in a non-human primate" 1012: 999: 1720: 1160: 1147:
Kimock, Clare M.; Dubuc, Constance; Brent, Lauren J. N.; Higham, James P. (December 2019).
344: 258:) show an extensive dimorphism in pelage colors or patterning. For example, in mandrills ( 8: 1617: 1585: 1392:"Sexual Dimorphism". The American Naturalist, vol. 37, no. 437, 1903, pp. 349–349., 1026:
Proximate causes of sexual size dimorphism in the Iguanian lizard Microlophus occipitalis
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Dunham, A. E.; Maitner, B. S.; Razafindratsima, O.H.; Simmons, M. C; Roy, C. L. (2013).
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Gordon, A. D. (2006). "Scaling of size and dimorphism in Primates II: Macroevolution".
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and nuchal musculature. Also, an unusual skeletal dimorphism includes enlarged, hollow
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Some sexual dimorphic traits in primates are known to appear on a temporary basis. In
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Is fatter sexier? Reproductive strategies of male squirrel monkeys (Saimiri sciureus)
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Schultz, A. H. (1962). "Metric age changes and sex differences in primate skulls".
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Ecological causes for the evolution of sexual dimorphism: a review of the evidence
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Hens, S. M. (2005). "Ontogeny of craniofacial sexual dimorphism in the orangutan (
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Dominance, status signals, and coloration in male mandrills (Mandrillus sphinx)
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Intrasexual selection also operates through female–female competition. Female
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Intrasexual competition and body weight dimorphism in anthropoid primates
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Plavcan, J. Michael (2001). "Sexual dimorphism in primate evolution".
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The nature and basis of sexual dimorphism in the primate skeleton
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primates tend to show a greater degree of dimorphism than
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A prime example of intrasexual selection can be found in
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Bouchet H, Pellier A, Blois-Heulin C, Lemasson A. 2010.
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Proceedings of the Royal Society B: Biological Sciences
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For example, in many 1704:Sexual reproduction in animals 800:: lack of sexual dimorphism". 666: 480:It has been hypothesized that 228:found in males of gibbons and 76:sexual selection of primates. 37:female (left) and male (right) 26:female (left) and male (right) 16:Sexual differences in primates 1: 760:Annual Review of Sex Research 500: 128: 1576:Sex as a biological variable 1559:Simultaneous hermaphroditism 419: 84: 7: 488: 266:Temporary sexual dimorphism 10: 1850: 1714:Penile-vaginal intercourse 1554:Sequential hermaphroditism 1173:10.1038/s41598-019-52633-4 1038:Pope, T. R. (2000-09-12). 1028:. Ecology 77(5):1473-1482. 239: 179: 1798: 1751: 1584: 1544:Testis-determining factor 1441: 495:Sex differences in humans 236:Pelage color and markings 1485:Sex-determination system 860:). I: Face and palate". 202:in adult male macaques, 168:have less variation and 79: 1433: 1376:10.1002/ajpa.1330970402 1365:10.1073/pnas.1633678100 1288:more precise citations. 616:Plavcan, J. M. (2001). 302:Cercopithecus neglectus 1468:Sexual differentiation 1108:10.1098/rspb.2014.1602 973:Human Nature 23:45-67. 704:: CS1 maint: others ( 190:processes. Studies on 176:Craniofacial structure 38: 27: 1510:Temperature-dependent 1056:10.1007/s002650000236 957:. 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1592: 1590: 1582: 1581: 1579: 1578: 1573: 1568: 1563: 1562: 1561: 1556: 1546: 1541: 1540: 1539: 1534: 1527:Sex chromosome 1524: 1519: 1518: 1517: 1512: 1507: 1502: 1497: 1492: 1482: 1481: 1480: 1475: 1465: 1464: 1463: 1458: 1447: 1445: 1439: 1438: 1431: 1430: 1423: 1416: 1408: 1402: 1401: 1398:10.1086/278295 1390: 1387:10.1086/202026 1379: 1368: 1356: 1343:(S33): 25–53. 1333: 1312: 1311: 1266: 1264: 1257: 1251: 1248: 1245: 1244: 1231: 1222: 1204: 1139: 1077: 1050:(4): 253–267. 1030: 1017: 1004: 988: 975: 959: 946: 933: 922:(3): 239–255. 906: 879: 858:Pongo pygmaeus 845: 819: 808:(4): 365–369. 788: 769: 747: 711: 682: 665: 628:(S33): 25–53. 551: 505: 504: 502: 499: 498: 497: 490: 487: 477: 474: 466:vervet monkeys 441: 440:Terrestriality 438: 421: 418: 410:strepsirrhines 384: 383:Mating systems 381: 357: 354: 341:howler monkeys 318: 315: 310: 307: 291: 288: 267: 264: 240:Main article: 237: 234: 230:howler monkeys 216: 213: 208:spider monkeys 196:foramen magnum 177: 174: 130: 127: 86: 83: 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1457: 1454: 1453: 1452: 1449: 1448: 1446: 1440: 1436: 1429: 1424: 1422: 1417: 1415: 1410: 1409: 1406: 1399: 1395: 1391: 1388: 1384: 1380: 1377: 1373: 1369: 1366: 1362: 1357: 1354: 1350: 1346: 1342: 1338: 1334: 1331: 1327: 1326:0-521-44411-X 1323: 1319: 1316: 1315: 1308: 1305: 1297: 1294:February 2023 1287: 1283: 1277: 1276: 1270: 1265: 1256: 1255: 1241: 1235: 1226: 1219: 1213: 1211: 1209: 1200: 1196: 1191: 1186: 1182: 1178: 1174: 1170: 1166: 1162: 1158: 1154: 1150: 1143: 1135: 1131: 1126: 1121: 1117: 1113: 1109: 1105: 1101: 1097: 1093: 1086: 1084: 1082: 1073: 1069: 1065: 1061: 1057: 1053: 1049: 1045: 1041: 1034: 1027: 1021: 1014: 1008: 1001: 995: 993: 985: 979: 972: 966: 964: 956: 950: 943: 937: 929: 925: 921: 917: 910: 902: 898: 894: 890: 883: 875: 871: 867: 863: 859: 852: 850: 842:(3): 457–465. 841: 837: 830: 823: 815: 811: 807: 803: 799: 792: 784: 780: 773: 765: 761: 754: 752: 742: 737: 734:: 2312–2320. 733: 729: 725: 718: 716: 707: 701: 693: 689: 685: 683:0-521-44411-X 679: 675: 669: 661: 657: 653: 649: 645: 641: 636: 631: 627: 623: 619: 612: 610: 608: 606: 604: 602: 600: 598: 596: 594: 592: 590: 588: 586: 584: 582: 580: 578: 576: 574: 572: 570: 568: 566: 564: 562: 560: 558: 556: 546: 541: 537: 533: 529: 525: 522:(Cebidae)]". 521: 517: 510: 506: 496: 493: 492: 486: 483: 473: 471: 467: 463: 459: 455: 454:Cercopithecus 450: 446: 437: 435: 431: 427: 426:Cercopithecus 417: 415: 411: 406: 403: 399: 394: 390: 380: 376: 374: 369: 366: 362: 353: 350: 346: 342: 337: 335: 330: 327: 323: 314: 306: 304: 303: 298: 287: 285: 284:female choice 281: 277: 273: 263: 261: 257: 253: 249: 243: 233: 231: 227: 223: 212: 209: 205: 201: 197: 193: 189: 183: 173: 171: 167: 162: 160: 156: 152: 148: 144: 140: 136: 126: 124: 123:callitrichine 120: 116: 112: 108: 104: 100: 96: 92: 77: 74: 70: 68: 64: 60: 56: 52: 51:strepsirrhine 47: 43: 36: 32: 25: 21: 1660:spermatozoon 1588:reproduction 1537:Y chromosome 1532:X chromosome 1478:Virilization 1473:Feminization 1340: 1336: 1317: 1300: 1291: 1272: 1234: 1225: 1159:(1): 19794. 1156: 1152: 1142: 1099: 1095: 1047: 1043: 1033: 1020: 1007: 978: 949: 936: 919: 915: 909: 892: 888: 882: 865: 861: 857: 839: 835: 822: 805: 801: 797: 791: 785:(1): 63–105. 782: 778: 772: 763: 759: 731: 727: 673: 668: 625: 621: 527: 523: 520:Cebus apella 519: 515: 509: 479: 469: 461: 458:blue monkeys 456:), arboreal 453: 443: 429: 425: 423: 407: 386: 377: 370: 359: 338: 331: 320: 312: 300: 293: 290:Vocalization 275: 269: 259: 255: 251: 248:Lemur macaco 247: 245: 218: 200:neurocranium 185: 163: 132: 88: 71: 40: 1286:introducing 895:: 124–138. 868:: 149–166. 545:11336/69038 530:: 744–757. 470:C. aethiops 445:Terrestrial 389:haplorhines 349:infanticide 226:hyoid bones 188:ontogenetic 170:cheek teeth 139:catarrhines 95:chimpanzees 67:monomorphic 1823:Categories 1721:Copulation 1442:Biological 1269:references 501:References 398:monogamous 393:polygynous 180:See also: 143:haplorhine 129:Tooth size 107:orangutans 53:primates ( 1776:Mechanics 1753:Sexuality 1648:Oogenesis 1623:Sex organ 1613:Germ cell 1601:Anisogamy 1181:2045-2322 1116:0962-8452 1064:0340-5443 700:cite book 644:0002-9483 420:Phylogeny 402:colobines 182:Allometry 111:mandrills 85:Body size 1808:Category 1786:Activity 1682:Internal 1677:External 1566:Intersex 1199:31874959 1134:25253459 802:Primates 692:28708379 660:31722173 652:11786990 489:See also 462:C. mitis 449:arboreal 192:hominids 166:incisors 151:macaques 103:gorillas 63:tarsiers 46:primates 1633:Meiosis 1606:Isogamy 1282:improve 1190:6930303 1161:Bibcode 1125:4211451 1072:2144926 766:: 1–19. 334:baboons 204:guenons 147:baboons 135:canines 99:bonobos 91:gibbons 59:lorises 1655:Gamete 1628:Mating 1586:Sexual 1461:Female 1324:  1271:, but 1197:  1187:  1179:  1132:  1122:  1114:  1070:  1062:  690:  680:  658:  650:  642:  430:Macaca 428:, and 414:lemurs 141:among 117:, and 61:) and 55:lemurs 1444:terms 1068:S2CID 832:(PDF) 656:S2CID 482:niche 80:Types 1665:ovum 1456:Male 1353:ISSN 1330:OCLC 1322:ISBN 1195:PMID 1177:ISSN 1130:PMID 1112:ISSN 1060:ISSN 706:link 688:OCLC 678:ISBN 648:PMID 640:ISSN 282:and 149:and 97:and 65:are 57:and 1435:Sex 1394:doi 1383:doi 1372:doi 1361:doi 1345:doi 1341:116 1185:PMC 1169:doi 1120:PMC 1104:doi 1100:281 1052:doi 924:doi 897:doi 893:124 870:doi 810:doi 736:doi 630:doi 626:116 540:hdl 532:doi 528:272 472:). 436:." 387:In 371:In 242:Fur 1825:: 1505:ZO 1500:XO 1495:ZW 1490:XY 1351:. 1339:. 1328:. 1207:^ 1193:. 1183:. 1175:. 1167:. 1155:. 1151:. 1128:. 1118:. 1110:. 1098:. 1094:. 1080:^ 1066:. 1058:. 1048:48 1046:. 1042:. 991:^ 962:^ 920:52 918:. 891:. 866:65 864:. 848:^ 840:51 838:. 834:. 806:13 804:. 783:27 781:. 764:16 762:. 750:^ 732:26 730:. 726:. 714:^ 702:}} 698:{{ 686:. 654:. 646:. 638:. 624:. 620:. 554:^ 538:. 526:. 254:, 250:, 113:, 109:, 105:, 69:. 1427:e 1420:t 1413:v 1400:. 1396:: 1389:. 1385:: 1378:. 1374:: 1367:. 1363:: 1347:: 1307:) 1301:( 1296:) 1292:( 1278:. 1201:. 1171:: 1163:: 1157:9 1136:. 1106:: 1074:. 1054:: 930:. 926:: 903:. 899:: 876:. 872:: 816:. 812:: 744:. 738:: 708:) 694:. 662:. 632:: 548:. 542:: 534:: 468:( 460:( 274:(

Index


Hamadryas baboon

Black howler monkey
Sexual dimorphism
primates
strepsirrhine
lemurs
lorises
tarsiers
monomorphic
Sexual dimorphism
gibbons
chimpanzees
bonobos
gorillas
orangutans
mandrills
hamadryas baboons
proboscis monkeys
callitrichine
canines
catarrhines
haplorhine
baboons
macaques
Microcebus rufus
Callicebus moloch
incisors
cheek teeth

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