Snowy Owl vs Southern Cassowary
Bubo scandiacus compared with Casuarius casuarius
Side-by-Side Comparison
| Attribute | Snowy Owl | Southern Cassowary |
|---|---|---|
| Scientific Name | Bubo scandiacus | Casuarius casuarius |
| Order | Strigiformes | Casuariiformes |
| Family | Strigidae | Casuariidae |
| Conservation Status | Vulnerable | Least Concern |
| Length | 63.0 cm (24.8 in) | 155.0 cm (61.0 in) |
| Wingspan | 145.0 cm (57.1 in) | 60.2 cm (23.7 in) |
| Weight | 2100.0 g (74.08 oz) | 58000.0 g (2045.89 oz) |
| Diet | Primarily lemmings on the breeding grounds, where a pair may consume over 1,500 per year. … | Primarily fallen fruit from the rainforest floor, also fungi, invertebrates, and small vertebrates. A critical … |
| Clutch Size | 3-14 | 3-8 |
| Population Trend | — | — |
Size Comparison
Habitat Comparison
Shared Habitats
None
Snowy Owl only
Southern Cassowary only
Snowy Owl
Arctic tundra for breeding. Winters in open habitats resembling tundra, including prairies, airports, shorelines, and agricultural fields.
Southern Cassowary
Tropical rainforests, mangroves, and adjacent habitat in New Guinea and northeastern Australia.
Song & Call Comparison
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.
Southern Cassowary
Produces very deep, booming rumbles and low-frequency calls below 20 Hz (infrasound), felt more than heard. Also gives loud bellowing grunts audible up to 1 km away.
Geographic Range & Migration
Snowy Owl
Circumpolar Arctic for breeding. Irruptive winter movements bring birds south to the northern United States, Europe, and Asia.
Southern Cassowary
New Guinea, nearby islands, and northeastern Queensland, Australia.
Conservation Status
Snowy Owl
Southern Cassowary
How to Tell Them Apart
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
Southern Cassowary
Glossy black hair-like plumage. Brilliant blue and red bare skin on the head and neck. A large bony casque crowns the head. Vestigial wings with no flight feathers.
Long, laterally compressed, dark grey bill
About These Birds
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.
Southern Cassowary
The southern cassowary is often called the most dangerous bird in the world due to its powerful legs and dagger-like inner claw that can reach 12 cm in length. Despite this reputation, cassowaries are vital rainforest keystone species, dispersing seeds of plants that no other animal can. The purpose of their distinctive casque remains debated.