A study led by the University of Michigan, in collaboration with Arizona State and Duke universities, examined why male chimpanzees form close relationships with each other, and found that male chimpanzees that build strong bonds with the alpha male of the group, or with a large network of other males, are more successful at siring offspring. The results are published in the journal iScience. For males, the biggest task is getting reproductive access to females. One function of these social bonds, the researchers found, is to help males gain access to mating opportunities they wouldn’t otherwise be able to get without help from their friends.
They found that males with more strong association ties — males with the highest number of social bonds with other males — had a higher likelihood of siring offspring. In fact, two or more strong association ties meant a male chimpanzee was more than 50% more likely to sire a given offspring.
— source University of Michigan | Aug 17, 2021
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