Emperor Penguin vs Ruddy Shelduck

Aptenodytes forsteri compared with Tadorna ferruginea

Key Differences

• Emperor Penguin is Near Threatened while Ruddy Shelduck is Not Evaluated.

Taxonomic Classification

Rank	Emperor Penguin	Ruddy Shelduck
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class same	Aves (Birds)	Aves (Birds)
Order	Sphenisciformes (Penguins)	Anseriformes (Anseriformes)
Family	Spheniscidae (Penguins)	Anatidae
Genus	Aptenodytes (Great Penguins)	Tadorna
Species	Aptenodytes forsteri	Tadorna ferruginea

Evolutionary Relationship

Emperor Penguin and Ruddy Shelduck share a common ancestor at the Class level: Aves. (Birds)

Conservation Status

Emperor Penguin

NT — Near Threatened

Population: ~595.0K

Trend: Stable →

Ruddy Shelduck

NE — Not Evaluated

Physical Characteristics

Attribute	Emperor Penguin	Ruddy Shelduck
Diet	Carnivore	—
Average Lifespan	20 years	—
Average Length	1.1 m	—
Average Weight	40.0 kg	—

Habitat & Geographic Range

Emperor Penguin

Habitat

Found across multiple habitat types including temperate broadleaf and mixed forests, temperate coniferous forests, and boreal forests and taiga, among 4 distinct biome types within the Palearctic biogeographic realm. Populations are also found in montane and highland environments at higher elevations.

Range

Found in Norway. Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

Ruddy Shelduck

Habitat

Typically found in various aerial, terrestrial, and aquatic environments.

Range

Widely distributed across Asia (Israel, Taiwan), Europe (19 countries), and North America (United States).

Emperor Penguin

The world's largest penguin, emperor penguins stand up to 1.2 meters and weigh 45 kg, inhabiting the Antarctic continent in some of the most extreme conditions on Earth. They breed in midwinter darkness at temperatures below -60°C, with males incubating single eggs on their feet under a brood pouch for 65 days while females are at sea. Their huddling behavior — cycling individuals through the warm center of thousands-strong groups — is a masterclass in cooperative survival.

Ruddy Shelduck

Ruddy Shelduck (Tadorna ferruginea) is classified as Not Evaluated (NE) on the IUCN Red List. Not yet evaluated against IUCN Red List criteria. Conservation status remains to be determined.

Shared Countries

Both species can be found in 1 countries:

🇳🇴 Norway