Forty percent of the species in the study had been observed engaging in lethal violence, but rates varied widely. (sciencemag.org)
That's the conclusion of a controversial new study, which reaches far back into our family tree to uncover the evolutionary roots of lethal violence among more than 1000 mammalian species. (sciencemag.org)
Wiessner says that the database of lethal violence among mammals is an impressive contribution. (sciencemag.org)