Boat-filled herons (C. cochlearias ridgwayi) were observed witha night vision device as they fed nocturnally in a Pacific Guatemalan marsh. They used 2 basic heron/egret feeding techniques previously described for other species. No specialized feeding behaviors were observed that could be related uniquely to the expanded bill. Food taken by boat-bills was similar to that of black-crowned and yellow-crowned night herons (Nycticorax nycticorax and Nyctanassa violacea) feeding in the same marsh. Because of the limited information on Cochlearius, none of the existing hypotheses are adequate to explain the shape of the bill as a feeding adaptation, and only a previous observation of the bill as a display character provides a plausible explanation.