I was going to get pics of a group of Long-tailed Ducks at Fort Phoenix this morning. They all dove and when one came back up, it wasn't the duck but this bird that I have never seen before. I figured it was an alcid and thought it was a Common Murre, but now I think it might be a Black Guillemot. It wasn't there for more than a few minutes when the Rowing Club went by and scared it away. I tried to re-find it but no luck.