Serri Graslie
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A wild horse at Assateague Island National Seashore in Maryland. The horses on the island are not given supplemental food or vet care, but the National Park Service darts its mares with a birth control vaccine to help reduce the size of the herd. Serri Graslie/NPR hide caption

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Serri Graslie/NPR

U.S. Uses Birth Control To Rein In Wild Horses

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