Summary: A study of bonobos in the wild challenges the perception of them as peaceful creatures, showing that male bonobos are actually more aggressive than male chimpanzees. The findings suggest that the self-domestication hypothesis, proposing that bonobos evolved to be less aggressive, may need refinement. The study provides new insights into the behavior of our closest living relatives and their potential influence on human evolution. Paraphrased News Format: A recent study on bonobos has revealed surprising findings about their behavior in the wild. Contrary to their peaceful reputation, male bonobos were observed to be almost three times as aggressive as male chimpanzees. This challenges the idea of bonobos as "hippie apes" and raises questions about the self-domestication hypothesis. The study sheds new light on the behavior of these primates and its potential implications for understanding human evolution.