Seagull feeding at Bellingham Bay

I was enjoying the sun and view when I noticed this couple at the bottom of Cornwall Ave. feeding the seagulls. At first I thought it was just going to be a feeding frenzy and then I noticed it was an air acrobat in trade for some food. The couple would throw the bread up and the seagulls would just hang in the air against the wind waiting for the pitch. This picture of a seagull has a piece of bread right in front of his mouth that I caught right before he ate it. I'm not sure who has who trained but it was well organized.