Male chimpanzees, who share females with other males, have _____ testicles for their body size compared with male gorillas, who are assured of paternity.

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Male chimpanzees have larger testicles for their body size compared to male gorillas because they have to produce more sperm to compete with other males for fertilization of the female's eggs. Male gorillas, on the other hand, have smaller testicles because they are assured of paternity and do not need to produce as much sperm.

Male Chimpanzees, Who Share Females with Other Males, Have _____