Polar bear vs

Ursus maritimus compared with Rhizocarpon oederi

Key Differences

Polar bear is Vulnerable while is Extinct.

Taxonomic Classification

Rank	Polar bear
Kingdom	Animalia (Animals)	Fungi (Fungi)
Phylum	Chordata (Chordates)	Ascomycota (Sac Fungi)
Class	Mammalia (Mammals)	Lecanoromycetes (Lecanoromycetes)
Order	Carnivora (Carnivorans)	Rhizocarpales (Rhizocarpales)
Family	Ursidae (Bears)	Rhizocarpaceae
Genus	Ursus (Bears)	Rhizocarpon
Species	Ursus maritimus	Rhizocarpon oederi

Conservation Status

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

EX — Extinct

Physical Characteristics

Attribute	Polar bear
Diet	Carnivore	—
Average Lifespan	25 years	—
Average Length	2.4 m	—
Average Weight	450.0 kg	—

Habitat & Geographic Range

Polar bear

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

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Denmark, Norway, and Sweden.

Polar bear

The largest land carnivore on Earth, polar bears can exceed 700 kg and are found across Arctic sea ice from Canada to Russia. Highly specialized marine mammals that rely on sea ice to hunt ringed and bearded seals. Excellent swimmers capable of covering vast distances in open water. Listed as Vulnerable, with populations under severe pressure from rapid Arctic sea ice loss due to climate change.

Rhizocarpon oederi is a crustose lichen historically recorded on siliceous rocks across parts of Europe and North America. It is now classified as Extinct (EX) on the IUCN Red List, representing one of the few lichen species confirmed to have been lost. Its disappearance is attributed to habitat destruction, air pollution, and the very specific microhabitat requirements that made it vulnerable.