Emperor Penguin vs Marbled Swimming Crab

Aptenodytes forsteri compared with Liocarcinus marmoreus

Key Differences

Emperor Penguin is Near Threatened while Marbled Swimming Crab is Not Evaluated.

Taxonomic Classification

Rank	Emperor Penguin	Marbled Swimming Crab
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Chordata (Chordates)	Arthropoda (Arthropods)
Class	Aves (Birds)	Malacostraca (Crustaceans)
Order	Sphenisciformes (Penguins)	Decapoda (Decapoda)
Family	Spheniscidae (Penguins)	Polybiidae
Genus	Aptenodytes (Great Penguins)	Liocarcinus
Species	Aptenodytes forsteri	Liocarcinus marmoreus

Evolutionary Relationship

Emperor Penguin and Marbled Swimming Crab share a common ancestor at the Kingdom level: Animalia. (Animals)

View Kingdom: Animalia

Conservation Status

Emperor Penguin

NT — Near Threatened

Population: ~595.0K

Trend: Stable →

Marbled Swimming Crab

NE — Not Evaluated

Physical Characteristics

Attribute	Emperor Penguin	Marbled Swimming Crab
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.

Marbled Swimming Crab

Habitat

Typically found in marine, freshwater, and terrestrial environments.

Range

Distributed across Belgium, Norway, Portugal, and Sweden.

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.