Ray Duffy reports: "Visited Mill Creek Marsh [Saturday] between 2:30 and 3:30 p.m. near low tide. As I was finishing my figure-eight loop of the park, I found a lone Bonaparte's Gull swimming near the bridge of the first pool.
More on Bonaparte's Gulls here.
Ray's Photos:
http://www.flickr.com/photos/rayduffy/4062780274/
http://www.flickr.com/photos/rayduffy/4062034505/