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How can male and female chimpanzees be told apart?
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chimpanzee
The West African, or masked, chimpanzee (Pan troglodytes verus) is a critically endangered subspecies of chimpanzee.
Male and female chimpanzees can be distinguished through several physical and physiological characteristics:
- Size and Build: Chimpanzees exhibit sexual dimorphism, meaning males are generally larger and more robust than females.1
- Genitalia: The most definitive way to tell them apart is by examining their external genitalia. Males possess a penis and scrotum, while females have a clitoris and labial folds.2
- Reproductive Cycles: Female chimpanzees undergo visible changes related to their reproductive cycle. During ovulation, females often experience significant swelling and coloration of the vulva and perineal region. This engorgement can reach notable proportions in chimpanzees.2
- Social Behavior: While not a physical trait, social context can provide clues. Adult males are generally dominant over adult females. Additionally, females with dependent offspring are more likely to be found ranging alone or in small parties within specific "core areas," whereas males are more involved in community-wide social dynamics and boundary patrols.3