Three coyotes are caught in leg-hold traps in this photo from a Wildlife Services trapper. Leg-hold traps are used by the agency to capture and kill 10,000 to 14,000 animals a year. Roughly half are coyotes, but many other species are targeted, too, including bobcats, muskrats and wild pigs. The agency's traps, which are banned in many countries, have also captured and killed 4,000 non-target animals since 2006, including great-blue herons, mule deer and black bears.

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