Bigeye Sixgill Shark vs Polar bear

Hexanchus nakamurai compared with Ursus maritimus

Key Differences

• Bigeye Sixgill Shark is Near Threatened while Polar bear is Vulnerable.

Taxonomic Classification

Rank	Bigeye Sixgill Shark	Polar bear
Kingdom same	Animalia (สัตว์)	Animalia (สัตว์)
Phylum same	Chordata (สัตว์มีแกนสันหลัง)	Chordata (สัตว์มีแกนสันหลัง)
Class	Elasmobranchii	Mammalia (สัตว์เลี้ยงลูกด้วยน้ำนม)
Order	Hexanchiformes (อันดับปลาฉลามครุย)	Carnivora (สัตว์กินเนื้อ)
Family	Hexanchidae	Ursidae (Bears)
Genus	Hexanchus	Ursus (Bears)
Species	Hexanchus nakamurai	Ursus maritimus

Evolutionary Relationship

Bigeye Sixgill Shark and Polar bear share a common ancestor at the Phylum level: Chordata. (สัตว์มีแกนสันหลัง)

Conservation Status

Bigeye Sixgill Shark

NT — Near Threatened

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

Physical Characteristics

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

Habitat & Geographic Range

Bigeye Sixgill Shark

Habitat

Native to Asia and South America, inhabiting ecosystems characteristic of the region.

Range

Distributed across Taiwan and Venezuela. 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.

Bigeye Sixgill Shark

The Bigeye Sixgill Shark (Hexanchus nakamurai) is a species in the genus Hexanchus. It is currently classified as Near Threatened on the IUCN Red List. Native to Asia and South America, inhabiting ecosystems characteristic of the region.

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.