Promiscuous ape species have bigger testicles
Chimpanzees produce 200 times more sperm than gorillas, the world’s largest primates, and 14 times more than orangutans, scientists based in Japan reveal.
Promiscuous ape species have bigger testicles, and the latest discovery finally provides evidence that they also produce more sperm.
Scientists previously proposed that chimps have large testicles because several males mate with a single female, and so have to produce more sperm in order to compete.
For their research, published in the American Journal of Primatology, scientists studied chimpanzees, orangutans and gorillas from zoos in Japan and Indonesia.