In this Jan. 14, 2017 photo, Dave Pauli, senior director for the U.S. Humane Society wildlife response team, shoots a horse with a vaccine dart as part of a birth control program to manage the horse population in Vieques, Puerto Rico, Saturday. Puerto Rico's tiny Vieques island is famed for its scenery and its free-roaming horses. But there are now so many that officials have joined the Humane Society in a campaign to hold down the population with a campaign of contraceptive darts. (AP Photo/Carlos Giusti)
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