By day the skimmer rests onshore, and at twilight the bird .... skimmer white

By day the skimmer rests onshore, and at twilight the bird feeds, skimming calm, shallow water with the bill tip submerged; when a fish or crustacean is encountered, the upper mandible snaps down. The three species are dark above and white below, with white face and forehead. The largest skimmer is the black skimmer ( Rynchops nigra ; see ) of America, which grows to 50 cm (20 inches) long. APA style: skimmer. skimmer white