I wasn’t sure if this was a Forster’s Tern or a Common Tern. I’m still not 100% certain but after reading about both, I’m inclined to think it’s a Forster’s Tern.
These birds are FAST. I had a hard time tracking and photographing them. I had many, many out of focus photos and these were the closest I cold get.
Maralee
Through My Lens 
Good shots. I have friends who have been attacked by arctic terns while trying to get a picture.
I guess some birds don’t like to have their picture taken.
Great captures, Maralee! They are a lot of fun to watch as they whiz by!
Its amazing how they can change directions so quickly.
I’m similarly inclined . . . nice.
Thanks.