In the forests of Uganda’s Kibale National Park, male chimpanzees on the make know what they want in a sexual partner—wrinkled skin, ragged ears, irregular bald patches, broken teeth, and elongated nipples. For these guys, nothing beats the sex appeal of an old female chimp.
COME HITHER LOOK. In Uganda, male chimps, such as the one on the left, prefer to mate with females older than 30 years, such as the one on the right.
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