Smoking Monkey

Chimpanzee testicles are unusually large for their body size, with a combined weight about 4 ounces (110 g) compared to a gorilla's 1 ounce (28 g) or a human's 1.5 ounces (43 g). This is generally attributed to sperm competition due to the polyandrous nature chimpanzee mating behavior. Chimpanzees reach puberty at an age between 8 and 10 years and rarely live past the age 40 in the wild, but have been known to reach the age more than 60 in captivity.
Behaviors
Anatomical differences between the Common Chimpanzee and the Bonobo are slight, but in sexual and social behaviour there are marked differences. The Common Chimpanzee has an omnivorous diet, a troop hunting culture based on beta males led by an alpha male, and highly complex social relationships. The Bonobo, on the other hand, has a mostly frugivorous diet and an egalitarian, nonviolent, matriarchal, sexually receptive behaviour. Bonobos are well known to have frequent sex, with bisexuality the norm for both males and females, and also to use sex to help prevent and resolve conflicts. Different groups chimpanzees also have different cultural behaviour with preferences for types tools. The Common Chimpanzee tends to display higher levels aggression than the Bonobo.