I got out of work a little bit early today and took the opportunity to walk the Liberty Loop at the Wallkill River NWR. It was a nice walk around the loop where I had 16 species identified. Highlights included 6 Short-eared Owls being very vocal and putting on quite a show, a Yellow-bellied Sapsucker, and on my way back to the car I had 5 TUNDRA SWANS fly over. The birds were heading south along the west side of the loop. They followed the loop into New Jersey and eventually headed back north, this time on the east side of the loop (which is where I was located), flying right over me, and back into New York State. I could tell from the shape of the head/bill that the birds were not Mute Swans, and I was thinking Tundra. Fortunately one of the birds was calling periodically, which lead me to conclude that they were indeed Tundra Swans. Of course, I had to listen to the call on my phone app to know this! What a nice surprise on an unplanned trip around the Liberty Loop!