The common chimpanzee gives birth to a single offspring. Usually the male solicits mating with an erect penis and his coat bristling (Estes, 1991). Most copulations are dorso-ventral (Estes, 1991). During estrus the perineum of the female will swell up (Estes, 1991).
presenting: This is where the female presents her hindquarters to the adult male to solicit mating, and is usually done after shows his erect penis or makes some noise by shaking a branch.
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