Of the many hundreds if not thousands of gulls I saw on the beach of San Felipe over the course of three days, one gull was different from the rest. It was much smaller with a dark bill. I made sure to takes its picture, and then identified it later (as I am not a gull expert!)
The gull was a Bonaparte's Gull in winter plumage. In summer, or breeding plumage, this gull has a completely black head.
The Bonaparte's Gull was named for Charles Lucien Bonaparte, a French ornithologist who was a nephew to Napoleon.
I photographed this gull just after sunrise. I stood in knee deep water and was facing the shore, to get the strong frontal lighting.