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Researchers planted this camera trap (complete with robotic toy cat) in order to study what local species prey on cats. Here, a great horned owl takes the bait. The cat was found not far away, mostly intact, suggesting that the owl probably discovered the ruse after its first bite. Image by Roland Kays, courtesy of "Candid Creatures: How Camera Traps Reveal the Mysteries of Nature, by Roland Kays (May 15, 2016 John Hopkins University Press)