Harpy Eagle vs Southern Cassowary
Harpia harpyja compared with Casuarius casuarius
Side-by-Side Comparison
| Attribute | Harpy Eagle | Southern Cassowary |
|---|---|---|
| Scientific Name | Harpia harpyja | Casuarius casuarius |
| Order | Accipitriformes | Casuariiformes |
| Family | Accipitridae | Casuariidae |
| Conservation Status | Vulnerable | Least Concern |
| Length | 100.0 cm (39.4 in) | 155.0 cm (61.0 in) |
| Wingspan | 200.0 cm (78.7 in) | 60.2 cm (23.7 in) |
| Weight | 7500.0 g (264.55 oz) | 58000.0 g (2045.89 oz) |
| Diet | Arboreal mammals including sloths, monkeys, and opossums, which make up over 70% of the diet. … | Primarily fallen fruit from the rainforest floor, also fungi, invertebrates, and small vertebrates. A critical … |
| Clutch Size | 2-3 | 3-8 |
| Population Trend | — | — |
Size Comparison
Habitat Comparison
Harpy Eagle
Tropical lowland rainforests, requiring large tracts of continuous forest with tall emergent trees for nesting.
Southern Cassowary
Tropical rainforests, mangroves, and adjacent habitat in New Guinea and northeastern Australia.
Song & Call Comparison
Harpy Eagle
Rarely heard; emits mournful whistled screams 'wheee-oo' and low croaking grunts near the nest. Vocalizations poorly documented given its remote Amazonian habitat.
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
Harpy Eagle
Central and South America from southern Mexico through Brazil and northern Argentina. Range is shrinking due to deforestation.
Southern Cassowary
New Guinea, nearby islands, and northeastern Queensland, Australia.
Conservation Status
Harpy Eagle
Southern Cassowary
How to Tell Them Apart
Harpy Eagle
Slate-black upperparts and head with a pale grey breast and white underparts with black barring. A distinctive split grey crest rises when the bird is alarmed.
Massive dark hooked bill, one of the largest of any eagle
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
Harpy Eagle
The harpy eagle is among the most powerful raptors in the world, with talons as large as a grizzly bear's claws. It is the national bird of Panama. Deforestation poses the greatest threat to this species, as each breeding pair requires a vast territory of undisturbed forest.
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.