In this Jan. 14, 2017 photo, Dickie Vest, a vet with the U.S. Humane Society wildlife response team, examines a horse during a birth control campaign to manage the horse population in Vieques, Puerto Rico. First imported by Spanish colonists, horses are used by many of Vieques’ 9,000-odd residents for running errands, taking children to school, transporting fishermen to their boats, competing in informal races between teenage boys and delivering late-night drinkers back home. (AP Photo/Carlos Giusti)
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