Arctic Tern vs Olrog's Gull
Sterna paradisaea مقارنةً بـ Larus atlanticus
Side-by-Side Comparison
| السمة | Arctic Tern | Olrog's Gull |
|---|---|---|
| الاسم العلمي | Sterna paradisaea | Larus atlanticus |
| الرتبة | Charadriiformes | Charadriiformes |
| الفصيلة | Laridae | Laridae |
| حالة الحفاظ | Least Concern | Near Threatened |
| الطول | 34,0 cm (13.4 in) | — |
| طول الجناح | 80,0 cm (31.5 in) | 78,3 cm (30.8 in) |
| الوزن | 110,0 g (3.88 oz) | 850,0 g (29.98 oz) |
| النظام الغذائي | Small fish and crustaceans caught by plunge-diving from the air. Hovers briefly before diving. | -- |
| عدد البيض في الوضع | 2-3 | -- |
| Population Trend | — | — |
Size Comparison
Habitat Comparison
Arctic Tern
Breeds on coastal and tundra habitats. Spends most of its life at sea over the open ocean. Nests in colonies on beaches and rocky shores.
Song & Call Comparison
Arctic Tern
A sharp, grating 'kree-yah' alarm call. Also gives 'kik-kik-kik' near the nest. Highly aggressive vocally during the Arctic breeding season. Calls are harsh and insistent.
Olrog's Gull
Geographic Range & Migration
Arctic Tern
Breeds in the Arctic and sub-Arctic. Migrates to the Antarctic, experiencing two summers per year. Found on every ocean.
Olrog's Gull
حالة الحفاظ
Arctic Tern
Olrog's Gull
How to Tell Them Apart
Arctic Tern
Pale grey upperparts, white underparts with a black cap. Blood-red bill and short red legs. Deeply forked tail streamers. Winter adults lose the full black cap.
Slender, pointed, bright red bill
Olrog's Gull
About These Birds
Arctic Tern
The Arctic tern holds the record for the longest known migration of any animal, traveling roughly 70,000 km annually from Arctic to Antarctic and back. Over its 30-year lifespan, it may fly the equivalent of three round trips to the Moon. This remarkable bird experiences more daylight than any other creature on Earth.
Olrog's Gull
Olrog's Gull, 55–58 cm, is an Endangered South American gull breeding in small colonies in Buenos Aires Province, Argentina. Very similar to Belcher's Gull. Piscivore; entirely dependent on mudflats and estuaries of the Buenos Aires coast. Threatened by industrial development of breeding and foraging sites.