In this Jan. 13, 2017 photo, Dave Pauli, senior director for the U.S. Humane Society wildlife response team, shows the vaccine dart used on horses as part of a birth control program to manage the horse population in Vieques, Puerto Rico. 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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