vs Polar bear

Clitocybe amarescens compared with Ursus maritimus

Key Differences

is Least Concern while Polar bear is Vulnerable.

Taxonomic Classification

Rank		Polar bear
Kingdom	Fungi (菌界)	Animalia (動物)
Phylum	Basidiomycota (担子菌門)	Chordata (脊索動物)
Class	Agaricomycetes (真正担子菌綱)	Mammalia (哺乳類)
Order	Agaricales (ハラタケ目)	Carnivora (ネコ目)
Family	Tricholomataceae	Ursidae (Bears)
Genus	Clitocybe	Ursus (Bears)
Species	Clitocybe amarescens	Ursus maritimus

Conservation Status

LC — Least Concern

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

Physical Characteristics

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

Habitat & Geographic Range

Habitat

Typically found in forest floors, decomposing wood, and soil ecosystems.

Range

Distributed across Belgium, Denmark, Norway, and Sweden.

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.

Clitocybe amarescens is a small, bitter-tasting agaric fungus in the family Tricholomataceae distributed across Northwestern and Northern Europe, with confirmed records from Belgium, Denmark, Norway, and Sweden. The specific epithet amarescens reflects the notably bitter flavor of the fruiting bodies, a characteristic that distinguishes it from some closely related Clitocybe species. The cap is typically whitish to pale greyish, smooth, with decurrent gills characteristic of the genus, and fruits in woodland margins, grassy clearings, and other semi-open habitats during autumn months. Like other Clitocybe species, it is a saprotrophic fungus contributing to decomposition of leaf litter and organic debris. The bitter taste likely serves as a deterrent against invertebrate predation. The species is assessed as Least Concern across its European range but, like other fungi of unimproved grasslands and forest margins, remains potentially sensitive to habitat changes driven by agricultural intensification, fertilizer application, and loss of structurally diverse woodland edges across Scandinavia and Western Europe.

Polar bear

地球上で最大の陸上肉食動物であるホッキョクグマは700kgを超えることがあり、カナダからロシアまでの北極海氷域全体に分布する。ワモンアザラシとヒゲアザラシを狩るために海氷に依存する高度に特化した海洋哺乳類である。広大な距離を泳ぐことができる優れた泳者でもある。脆弱種に指定されており、気候変動による急激な北極海氷の消失で個体群が深刻な圧力を受けている。