Common Male Fern vs Polar bear

Dryopteris filix-mas compared with Ursus maritimus

Key Differences

Common Male Fern is Least Concern while Polar bear is Vulnerable.

Taxonomic Classification

Rank	Common Male Fern	Polar bear
Kingdom	Plantae (植物)	Animalia (動物)
Phylum	Tracheophyta	Chordata (脊索動物)
Class	Polypodiopsida (ウラボシ綱)	Mammalia (哺乳類)
Order	Polypodiales (ウラボシ目)	Carnivora (ネコ目)
Family	Dryopteridaceae	Ursidae (Bears)
Genus	Dryopteris	Ursus (Bears)
Species	Dryopteris filix-mas	Ursus maritimus

Conservation Status

Common Male Fern

LC — Least Concern

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

Physical Characteristics

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

Habitat & Geographic Range

Common Male Fern

Habitat

Typically found in moist, shaded forest floors and tropical canopies.

Range

Widely distributed across Europe (7 countries), North America (United States), Oceania and the Pacific (New Zealand), and South America (Chile).

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.

Common Male Fern

<em>Dryopteris filix-mas</em>, the common male fern, is a robust, semi-evergreen fern in the family Dryopteridaceae, widely distributed across Europe, North America, Oceania, and South America. It is classified as Least Concern on the IUCN Red List. This species typically grows in moist, shaded forest floors, hedgebanks, rocky slopes, and stream margins, preferring acidic to neutral soils in temperate environments. The common male fern produces large, pinnate fronds that can reach over one metre in length, arising from a central crown of scaly rhizomes. It is one of the most familiar ferns of the Northern Hemisphere and has been used medicinally for centuries, with extracts historically employed as an anthelmintic to treat tapeworm infections. The species reproduces via spores produced in kidney-shaped sori arranged in rows on the undersides of fertile fronds. Common male fern plays an important role in forest ecosystems, providing shelter and habitat structure for invertebrates and small vertebrates across its broad temperate range.

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。