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Understanding the reproductive biology of endangered mountain gorillas (Gorilla beringei beringei) is essential for optimizing conservation strategies, determining any demographic impact of socioecological changes, and providing information for comparative studies of primates. Non‐invasive techniques have been used to assess the reproductive function of many primates and the importance of validating...
Conspicuous swellings of the perineal skin can be observed in females of many catharrine primate species particularly during the middle stages of the ovarian cycle. The functional significance of this trait remains poorly understood. Recently, two hypotheses, the ''reliable indicator'' hypothesis and the ''graded signal'' hypothesis that take into account not only the pattern but also the exaggerated...
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