King Penguin vs Southern Cassowary
Aptenodytes patagonicus compared with Casuarius casuarius
Side-by-Side Comparison
| Attribute | King Penguin | Southern Cassowary |
|---|---|---|
| Scientific Name | Aptenodytes patagonicus | Casuarius casuarius |
| Order | Sphenisciformes | Casuariiformes |
| Family | Spheniscidae | Casuariidae |
| Conservation Status | Least Concern | Least Concern |
| Length | 95.0 cm (37.4 in) | 155.0 cm (61.0 in) |
| Wingspan | 64.0 cm (25.2 in) | 60.2 cm (23.7 in) |
| Weight | 14000.0 g (493.84 oz) | 58000.0 g (2045.89 oz) |
| Diet | Primarily lanternfish and squid caught during deep dives. Routinely dives to 100-300 meters, sometimes exceeding … | Primarily fallen fruit from the rainforest floor, also fungi, invertebrates, and small vertebrates. A critical … |
| Clutch Size | 1 | 3-8 |
| Population Trend | — | — |
Size Comparison
Habitat Comparison
King Penguin
Breeds on sub-Antarctic islands with flat or gently sloping beaches. Forages in the Southern Ocean.
Southern Cassowary
Tropical rainforests, mangroves, and adjacent habitat in New Guinea and northeastern Australia.
Song & Call Comparison
King Penguin
Uses individually unique complex calls for mate and chick recognition in noisy colonies. Produces a loud, musical trumpeting. Chick whistles are distinctive per family unit.
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
King Penguin
Sub-Antarctic islands including South Georgia, Crozet, Kerguelen, Macquarie, and Falkland Islands.
Southern Cassowary
New Guinea, nearby islands, and northeastern Queensland, Australia.
Conservation Status
King Penguin
Southern Cassowary
How to Tell Them Apart
King Penguin
Dark blue-grey back with white belly. Vivid orange-gold auricular patches on the sides of the head and upper breast. Silvery-grey upperparts.
Long, slender, slightly decurved bill with orange mandible plates
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
King Penguin
The king penguin is the second-largest penguin species, known for its striking orange-gold head markings. Unlike most penguins, king penguins do not build nests — they incubate their single egg on their feet. Their 14-16 month breeding cycle is the longest of any penguin species.
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.