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Mountain gorilla tug-of-war: silverbacks have limited control over reproduction in multimale groups.
Paternity analysis of 48 offspring born into four groups between 1985 and 1999 revealed that, although all infants were sired by within-group males, the socially dominant silverback did not always monopolize reproduction within his group, suggesting a "tug-of-war" scenario in which neither the dominant nor the second-ranking male has full control over his relative reproductive share. Expand
Origins and Evolution of Language and Speech
Some people may be laughing when looking at you reading in your spare time. Some may be admired of you. And some may want be like you who have reading hobby. What about your own feel? Have you feltExpand
Primate Communication and the Gestural Origin of Language [and Comments and Reply]
Wallace, Tylor, Wundt, Johannesson, and others have proposed that human language had its basis in hand and arm gestures. The Gardners' work with the chimpanzee Washoe, Premack's study of theExpand
Age-related patterns of reproductive success among female mountain gorillas.
Age-related patterns seem most likely to reflect changes in the physical condition of the mother, but more detailed studies are needed to quantify those physical differences, and to obtain behavioral evidence that would provide more direct measures of maternal investment and experience. Expand
A neural substrate for affiliative behavior in nonhuman primates.
Studies of social behavior following localized brain lesions in several species of Old World monkeys suggest there is an anatomical substrate for the maintenance of social bonds. Destruction ofExpand
Serum testosterone, male dominance, and aggression in captive groups of vervet monkeys (Cercopithecus aethiops sabaeus)
A striking finding was the marked within-subject variation in testosterone concentration: 5- to 10-fold fluctuations were often observed on successive days in stable vervet monkey social groups. Expand
Long-term dominance relationships in female mountain gorillas: strength, stability and determinants of rank
It is proposed that the dominance relationships of female mountain gorilla are best characterized as ‘Dispersal-Individualistic’ instead of the previously suggested ‘Egalitarian’, which fit within growing evidence for linear individualistic hierarchies in some primates. Expand
Personality dimensions and their behavioral correlates in wild Virunga mountain gorillas (Gorilla beringei beringei).
Ratings on 116 wild mountain gorillas monitored by the Dian Fossey Gorilla Fund provide insights into how species differences in personality are related to ecology, social systems, and life history. Expand
Personality and subjective well‐being in captive male western lowland gorillas living in bachelor groups
The results indicate that humans can reliably assess the personality and subjective well‐being of captive male gorillas living in bachelor groups with robust levels of inter‐rater reliability and validity and advocate for the use of personality questionnaires in the captive management of bachelor gorillas over long‐term multi‐institutional behavioral studies. Expand
Loss of estrus in human evolution: Too many answers, too few questions
No single pattern emerges that can be said to characterize the human female, and no conclusion can be reached regarding the relationship between cyclic hormonal fluctuations and sexual behavior and, thus, whether human ovulation is concealed. Expand