One study shows that male bonobos engage in violence more often, though less intensely, than male chimpanzees

Phie Jacobs, Bonobos, the 'hippie chimps,' might not be so mellow after all, Science, April, 12, 2024.

Chimps ( Pan troglodytes) and bonobos ( Pan paniscus) are the closest surviving relatives of modern humans. That makes them interesting subjects for scientists studying how aggression evolved in our own species. But the two apes are very different in their behavior. Chimps are patriarchal, forming all-male coalitions that patrol their territory; they react violently when they happen upon an outsider or neighboring clan. "Chimpanzee intergroup encounters are not possible," Mouginot explains. "They will kill each other."

Bonobos-which some have called ...