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Azania (3.75 years of age in this image) with her mother Lia, here nursing 8 months after the emergence of her first molars. This photograph was taken during a 21-month photographic study of first molar eruption in chimpanzees, which was conducted at the Kanyawara Community of chipmanzees in Kibale National Park, Uganda.
For more information about the study, click here.
Image credit: Richard Wrangham