Swallow-tailed Gull vs Heermann's Gull
Creagrus furcatus مقارنةً بـ Larus heermanni
Side-by-Side Comparison
| السمة | Swallow-tailed Gull | Heermann's Gull |
|---|---|---|
| الاسم العلمي | Creagrus furcatus | Larus heermanni |
| الرتبة | Charadriiformes | Charadriiformes |
| الفصيلة | Laridae | Laridae |
| حالة الحفاظ | Least Concern | Near Threatened |
| الطول | — | — |
| طول الجناح | 81,8 cm (32.2 in) | 67,2 cm (26.5 in) |
| الوزن | 695,0 g (24.52 oz) | 448,26666666666665 g (15.81 oz) |
| النظام الغذائي | -- | -- |
| عدد البيض في الوضع | 1 | 1-2 |
| Population Trend | — | — |
Habitat Comparison
حالة الحفاظ
Least Concern
Swallow-tailed Gull
Near Threatened
Heermann's Gull
About These Birds
Swallow-tailed Gull
Swallow-tailed Gull, 55–60 cm, is the world's only fully nocturnal gull, breeding on the Galápagos Islands and roosting on the Humboldt Current. Distinctive red orbital ring, black-and-white head, deeply forked tail. Feeds at sea at night on squid and fish attracted to surface by bioluminescence.
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.