This tern just flew south right in front of my window (about 1:45 pm) on the Willamette River near the north end of Ross Island - South Waterfront. He was cruising slowly close to the western shore right under my nose! Looking through the bins I saw a partial black cap - and the rest looked all white from above, very uniform in shading overall - I'm on the 6th floor looking down on him. I didn't see any carpal bar or other particular shadings in the wings from above. The secondaries all looked light. The bill was tiny. Could this be an Arctic???
I picked up my camera and did a "Hail Mary" shoot as he was leaving my view from my balcony. I got these pics.