In this Friday, Feb. 6, 2015 photo, sandhill cranes leave the area in small groups after they gathered at a roosting location for the night along their winter migration route in Cecilia, Ky. These birds, which are part of the eastern population of sandhill cranes, are part of a group estimated to be larger than 70,000 birds, many of which were wintering in Florida. David Stephenson/AP Photo