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Life sciences/Evolutionary biology

Movies like the 'Lion King' have given hyenas a bad reputation of lawless scavengers. But these unique hunters actually live in complex social groups.

When it comes to social hierarchy in wild baboons, top-ranking or “alpha” males have higher stress hormone levels than second-ranking males, suggesting that being at the very top of baboon society may be more costly than previously thought, reports a new study in the 15 July issue of the journal Science.