Arctic Tern vs Snowy Owl
Sterna paradisaea เปรียบเทียบกับ Bubo scandiacus
Side-by-Side Comparison
| คุณสมบัติ | Arctic Tern | Snowy Owl |
|---|---|---|
| ชื่อวิทยาศาสตร์ | Sterna paradisaea | Bubo scandiacus |
| อันดับ | Charadriiformes | Strigiformes |
| วงศ์ตระกูล | Laridae | Strigidae |
| สถานะการอนุรักษ์ | Least Concern | Vulnerable |
| ความยาว | 34.0 cm (13.4 in) | 63.0 cm (24.8 in) |
| กว้างปีก | 80.0 cm (31.5 in) | 145.0 cm (57.1 in) |
| น้ำหนัก | 110.0 g (3.88 oz) | 2100.0 g (74.08 oz) |
| อาหาร | Small fish and crustaceans caught by plunge-diving from the air. Hovers briefly before diving. | Primarily lemmings on the breeding grounds, where a pair may consume over 1,500 per year. … |
| จำนวนไข่ | 2-3 | 3-14 |
| Population Trend | — | — |
Size Comparison
Habitat Comparison
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Arctic Tern only
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Snowy Owl only
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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.
Snowy Owl
Arctic tundra for breeding. Winters in open habitats resembling tundra, including prairies, airports, shorelines, and agricultural fields.
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.
Snowy Owl
Male gives a deep booming hoot 'hooooo' and a rising 'hoo-hoo' series. Also barks sharply when alarmed. Quieter than many owls; silent during long Arctic winter hunts.
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.
Snowy Owl
Circumpolar Arctic for breeding. Irruptive winter movements bring birds south to the northern United States, Europe, and Asia.
สถานะการอนุรักษ์
Arctic Tern
Snowy Owl
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
Snowy Owl
Adult males are almost entirely white. Females and immatures have dark brown barring and spotting. Yellow eyes and fully feathered feet.
Dark hooked bill mostly hidden by dense facial feathering
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.
Snowy Owl
The snowy owl is the heaviest North American owl and one of the most charismatic Arctic birds. Unlike most owls, it is largely diurnal, necessitated by the continuous daylight of Arctic summers. Snowy owl irruptions — periodic mass southward movements — are tied to lemming population cycles.