Common Oak Fern vs Tiger

Gymnocarpium dryopteris compared with Panthera tigris

Key Differences

• Common Oak Fern is Critically Endangered while Tiger is Endangered.

Taxonomic Classification

Rank	Common Oak Fern	Tiger
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	Cystopteridaceae	Felidae (Cats)
Genus	Gymnocarpium	Panthera (Big Cats)
Species	Gymnocarpium dryopteris	Panthera tigris

Conservation Status

Common Oak Fern

CR — Critically Endangered

Tiger

EN — Endangered

Population: ~4.5K

Trend: Increasing ↑

Physical Characteristics

Attribute	Common Oak Fern	Tiger
Diet	—	Carnivore
Average Lifespan	—	20 years
Average Length	—	3.0 m
Average Weight	—	220.0 kg

Habitat & Geographic Range

Common Oak Fern

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 across Europe (6 countries) and North America (Canada, United States). Currently classified as Critically Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Tiger

Habitat

Found across multiple habitat types including tropical and subtropical moist broadleaf forests, tropical and subtropical dry broadleaf forests, and tropical and subtropical grasslands and savannas, among 6 distinct biome types spanning the Neotropic and Oceanian realms. Populations are also found in montane and highland environments at higher elevations.

Range

Distributed across Colombia and Ecuador. Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Common Oak Fern

<em>Gymnocarpium dryopteris</em>, the common oak fern, is a delicate terrestrial fern in the family Cystopteridaceae (or Woodsiaceae, depending on classification). Despite its common name, the species is not specifically associated with oak trees; rather, it typically grows in cool, moist, shaded environments including boreal and mixed forests, rocky woodland slopes, stream banks, and shaded cliff faces. <em>Gymnocarpium dryopteris</em> spreads by rhizomes and forms low, spreading colonies with characteristic triangular, three-pinnate fronds that emerge from a slender creeping rootstock. Its geographic range spans Europe and North America, with populations in cool temperate and boreal zones. The species is currently assessed as Critically Endangered in certain regional assessments, suggesting that particular populations face severe decline, likely due to habitat loss, forest fragmentation, and altered hydrology, even if the species retains a broader global range. Biological traits such as lifespan, body size, and diet remain poorly documented at a standardized population level. <em>Gymnocarpium dryopteris</em> is a characteristic indicator of undisturbed cool woodland habitats and is valued for both its ecological role in forest understoreys and its aesthetic appeal.

Tiger

地球上最大の野生ネコ科動物で、体重が300kgを超えることもあり、ロシア極東から東南アジアにかけての森林に生息する。まだら光の中で擬態効果を持つ独特のオレンジと黒の縞模様の毛皮を持つ単独待ち伏せ型捕食者である。密猟と森林破壊により野生個体数が4,000頭未満に減少した深刻な危機（CR）種である。