Bermuda Saw-whet Owl vs Snowy Owl
Aegolius gradyi 对比 Bubo scandiacus
Side-by-Side Comparison
| 属性 | Bermuda Saw-whet Owl | Snowy Owl |
|---|---|---|
| 学名 | Aegolius gradyi | Bubo scandiacus |
| 目 | Strigiformes | Strigiformes |
| 科 | Strigidae | Strigidae |
| 保护状况 | Extinct | Vulnerable |
| 体长 | — | 63.0 cm (24.8 in) |
| 翼展 | — | 145.0 cm (57.1 in) |
| 体重 | — | 2100.0 g (74.08 oz) |
| 食性 | -- | Primarily lemmings on the breeding grounds, where a pair may consume over 1,500 per year. … |
| 产卵数 | -- | 3-14 |
| Population Trend | — | — |
Size Comparison
Habitat Comparison
Snowy Owl
Arctic tundra for breeding. Winters in open habitats resembling tundra, including prairies, airports, shorelines, and agricultural fields.
Song & Call Comparison
Bermuda Saw-whet Owl
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
Bermuda Saw-whet Owl
Snowy Owl
Circumpolar Arctic for breeding. Irruptive winter movements bring birds south to the northern United States, Europe, and Asia.
保护状况
Bermuda Saw-whet Owl
Snowy Owl
How to Tell Them Apart
Bermuda Saw-whet Owl
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
Bermuda Saw-whet Owl
百慕大锯木鸮（Aegolius gradyi）曾是一种小型猫头鹰，特产于百慕大，于17世纪因人类定居和引进物种灭绝。属鸱鸮科（Strigidae），仅凭化石骨骼得知其存在。
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.