Heermann's Gull vs Forster's Tern
Larus heermanni ile kıyaslandığında Sterna forsteri
Side-by-Side Comparison
| Özellik | Heermann's Gull | Forster's Tern |
|---|---|---|
| Bilimsel Ad | Larus heermanni | Sterna forsteri |
| Takım | Charadriiformes | Charadriiformes |
| Familya | Laridae | Laridae |
| Koruma Durumu | Near Threatened | Least Concern |
| Uzunluk | — | — |
| Kanat Açıklığı | 67,2 cm (26.5 in) | 50,5 cm (19.9 in) |
| Ağırlık | 448,26666666666665 g (15.81 oz) | 151,25 g (5.34 oz) |
| Beslenme | -- | -- |
| Kuluçka Büyüklüğü | 1-2 | 2-3 |
| Population Trend | — | — |
Habitat Comparison
Koruma Durumu
Near Threatened
Heermann's Gull
Least Concern
Forster's Tern
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.
Forster's Tern
Forster's Tern, 33–36 cm, breeds in interior North American marshes and winters along both US coasts and into Mexico. Distinctive frosted silver upperparts and orange-based bill. In non-breeding plumage, shows a black eye-mask. Piscivore; hovers and plunge-dives in coastal bays and lagoons.