The smallest diving duck in North America, the Bufflehead breeds in ponds and small lakes in Canada, and winters in much of the United States.
The Bufflehead is a diver and unlike other diving ducks can take flight from water without having to run along the surface. Buffleheads typically eat aquatic insects, snails, crustaceans and aquatic plants. Buffleheads usually are seen in small groups. As one or two feed, the others will stand watch for potential danger.

This Bufflehead was keeping its distance from me. I was lucky to make images with this much detail.

Waterfowl Observation Area @ Moraine State Park, Prospect, PA