vs Polar bear

Clitocybe agrestis 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 agrestis	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, Portugal, 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 agrestis is a small, pale agaric fungus in the family Tricholomataceae found across Western and Northern Europe, recorded from Belgium, Denmark, Norway, Portugal, and Sweden. It typically inhabits open grassy habitats including meadows, pastures, lawns, and roadsides, fruiting in autumn when moisture conditions are favorable. The cap is whitish to pale buff, often inrolled when young and becoming broadly flattened to slightly funnel-shaped with age, with crowded, decurrent gills and a short cylindrical stipe. The genus Clitocybe is characterized by the funnel-shaped or depressed cap and decurrent gill arrangement that gives many species a distinctive appearance. C. agrestis is a saprotrophic decomposer, breaking down plant litter and organic matter in grassland soils. It may be confused with toxic Clitocybe species, making accurate identification important. The species is listed as Least Concern, though European grassland fungi broadly face pressure from agricultural intensification, nitrogen deposition, and conversion of diverse meadows to monoculture pastures.

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。