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Adult onset Diabetes mellitus (Type 2 Diabetes), currently afflicting millions of humans, has been reported for captive chimpanzees. Given relatively high rates of obesity and relative inactivity in captive chimpanzees, this disorder seems to be surprisingly rare. There is no information on the occurrence of Type 2 diabetes in wild great ape populations. There are no reports for gorillas. So far, there are no reports of type 1 (Juvenile onset) Diabetes in great apes.