Unspotted Saw-whet Owl vs Snowy Owl
Aegolius ridgwayi в сравнении с Bubo scandiacus
Side-by-Side Comparison
| Характеристика | Unspotted Saw-whet Owl | Snowy Owl |
|---|---|---|
| Научное название | Aegolius ridgwayi | Bubo scandiacus |
| Отряд | Strigiformes | Strigiformes |
| Семейство | Strigidae | Strigidae |
| Охранный статус | Least Concern | Vulnerable |
| Длина | — | 63,0 cm (24.8 in) |
| Размах крыльев | 27,7 cm (10.9 in) | 145,0 cm (57.1 in) |
| Масса | 86,0 g (3.03 oz) | 2100,0 g (74.08 oz) |
| Питание | -- | Primarily lemmings on the breeding grounds, where a pair may consume over 1,500 per year. … |
| Размер кладки | 5-6 | 3-14 |
| Population Trend | — | — |
Size Comparison
Habitat Comparison
Общие среды обитания
Нет
Unspotted Saw-whet Owl only
Snowy Owl only
Snowy Owl
Arctic tundra for breeding. Winters in open habitats resembling tundra, including prairies, airports, shorelines, and agricultural fields.
Song & Call Comparison
Unspotted 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
Unspotted Saw-whet Owl
Snowy Owl
Circumpolar Arctic for breeding. Irruptive winter movements bring birds south to the northern United States, Europe, and Asia.
Охранный статус
Unspotted Saw-whet Owl
Snowy Owl
How to Tell Them Apart
Unspotted 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
Unspotted Saw-whet Owl
The Unspotted Saw-whet Owl (<em>Aegolius ridgwayi</em>) is a small owl belonging to the family Strigidae (True Owls). It inhabits forest environments, typically montane or highland forest zones within its range. Detailed plumage and behavioral descriptions of this species are limited in the available literature. No nesting type information is currently available for this species, though members of the genus Aegolius are generally cavity nesters. Clutch size is recorded as 5 to 6 eggs, which is relatively large for a small …
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.