My first trip of the winter to Pocosin Lakes National Wildlife Refuge did not disappoint. It never does.  It was a bluebird day. The moon was setting to the west and Tundra Swans were leaving Pungo Lake in small flocks.  Tundra Swans are abundant on the refuge, one of the most significant overwintering areas on the Atlantic coast. It was only a matter of time for a flock to pass in front of the moon.