A local park I lived near was a great place for bird photography - and some of the Gulf skimmers would come by in the morning for skim for breakfast. Standing on the edge of the park's lake, I would pan them as they flew by me, lower mandibles in the water.

Nikon D200, handheld, Nikkor 70-300 lens, shutter priority, 1/320 second; f/5.6; ISO 320.