Emperor Penguin vs

Aptenodytes forsteri compared with Nostoc calcicola

Key Differences

Emperor Penguin is Near Threatened while is Vulnerable.

Taxonomic Classification

Rank	Emperor Penguin
Kingdom	Animalia (Animals)	Bacteria (Bacteria)
Phylum	Chordata (Chordates)	Cyanobacteria (Cyanobacteria)
Class	Aves (Birds)	Cyanobacteriia
Order	Sphenisciformes (Penguins)	Cyanobacteriales
Family	Spheniscidae (Penguins)	Nostocaceae
Genus	Aptenodytes (Great Penguins)	Nostoc
Species	Aptenodytes forsteri	Nostoc calcicola

Conservation Status

Emperor Penguin

NT — Near Threatened

Population: ~595.0K

Trend: Stable →

VU — Vulnerable

Physical Characteristics

Attribute	Emperor Penguin
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.

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Norway and Sweden. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

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.

Nostoc calcicola is a filamentous, nitrogen-fixing cyanobacterium that forms gelatinous, dark-green to blackish colonies on damp calcareous rock surfaces, soil, and stone walls. It is distributed across temperate and Mediterranean regions, particularly in humid habitats with calcium-rich substrates. Classified as Vulnerable, this species is threatened by habitat loss, urban development, and the degradation of its calcareous rock microhabitats.