Heermann's Gull vs Black Skimmer
Larus heermanni so với Rynchops niger
Side-by-Side Comparison
| Thuộc Tính | Heermann's Gull | Black Skimmer |
|---|---|---|
| Tên Khoa Học | Larus heermanni | Rynchops niger |
| Bộ | Charadriiformes | Charadriiformes |
| Họ | Laridae | Laridae |
| Tình Trạng Bảo Tồn | Near Threatened | Least Concern |
| Chiều Dài | — | — |
| Chiều Dài Sải Cánh | 67,2 cm (26.5 in) | 73,1 cm (28.8 in) |
| Khối Lượng | 448,26666666666665 g (15.81 oz) | 293,6666666666667 g (10.36 oz) |
| Chế Độ Ăn | -- | -- |
| Số Trứng | 1-2 | 1-6 |
| Population Trend | — | — |
Habitat Comparison
Tình Trạng Bảo Tồn
Near Threatened
Heermann's Gull
Least Concern
Black Skimmer
About These Birds
Heermann's Gull
Heermann's Gull, 46–51 cm, is distinctive — dark grey body, white head (breeding), red bill. Breeds almost entirely on Isla Rasa in the Gulf of California, then disperses north along the Pacific coast to British Columbia. Kleptoparasite; steals fish from Brown Pelicans. Near Threatened; range highly restricted.
Black Skimmer
Black Skimmer: 40–50 cm, the largest skimmer with jet black upperparts, white underparts, and an outsized red-and-black bill with protruding lower mandible. Inhabits large rivers, estuaries, and coastal lagoons of North and South America. Feeds at dawn and dusk by skimming water surface. Nests colonially on sandy beaches. Partly migratory.