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Manatees huddle up at the Three Sisters Springs in Crystal River, Fla., to stay warm in the natural spring on Thursday, January 4, 2018. Three Sisters Springs is part of the Crystal River National Wildlife Refuge and is a manatee sanctuary in the winter where Manatees swim to escape the cold water. As Florida experiences unusually cold temperatures and even snow in some parts, wildlife officials are keeping a close eye on vulnerable manatees and sea turtles. (Photo by Luis Santana/Tampa Bay Times via AP Photo)
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