Chestnut Bolete vs Polar bear

Gyroporus castaneus compared with Ursus maritimus

Key Differences

Chestnut Bolete is Near Threatened while Polar bear is Vulnerable.

Taxonomic Classification

Rank	Chestnut Bolete	Polar bear
Kingdom	Fungi (เห็ดรา)	Animalia (สัตว์)
Phylum	Basidiomycota (Club Fungi)	Chordata (สัตว์มีแกนสันหลัง)
Class	Agaricomycetes (Mushrooms)	Mammalia (สัตว์เลี้ยงลูกด้วยน้ำนม)
Order	Boletales (Boletales)	Carnivora (สัตว์กินเนื้อ)
Family	Gyroporaceae	Ursidae (Bears)
Genus	Gyroporus	Ursus (Bears)
Species	Gyroporus castaneus	Ursus maritimus

Conservation Status

Chestnut Bolete

NT — Near Threatened

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

Physical Characteristics

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

Habitat & Geographic Range

Chestnut Bolete

Habitat

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

Range

Widely distributed across Asia (Taiwan), Europe (4 countries), North America (United States), and South America (Brazil). Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

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.

Chestnut Bolete

The Chestnut Bolete (Gyroporus castaneus) is a species in the genus Gyroporus. It is currently classified as Near Threatened on the IUCN Red List. Typically found in forest floors, decomposing wood, and soil ecosystems.

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.