In Botswana’s Okavango Delta, lions often prey on cattle. Scientists tested a simple trick: painting large, staring eyes on the rear ends of cows. Lions, as ambush predators, rely on surprise. Seeing what looks like a watchful face from behind makes them think they’ve been spotted, so they abandon the hunt. The method cut livestock losses dramatically—none of the “eye-cows” were killed during the trial.
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