In this Thursday, Dec. 14, 2017 photo, a snowy owl sits atop a fence post after being released along the shore of Duxbury Beach in Duxbury, Mass. The owl is one of 14 trapped so far this winter at Boston's Logan Airport and moved to the beach on Cape Cod Bay. The large white raptors from the Arctic have descended on the northern U.S. in huge numbers in recent weeks, giving researchers opportunities to study them. (AP Photo/Charles Krupa)