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The female infant chimpanzee Azania showing eruption of both lower first molars (M1s) shortly before this photograph was taken at 3.1 years of age. 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: Andrew Bernard