Polar bear vs Prickly deep-sea skate

Ursus maritimus compared with Brochiraja spinifera

Key Differences

• Polar bear is Vulnerable while Prickly deep-sea skate is Data Deficient.

Taxonomic Classification

Rank	Polar bear	Prickly deep-sea skate
Kingdom same	Animalia (สัตว์)	Animalia (สัตว์)
Phylum same	Chordata (สัตว์มีแกนสันหลัง)	Chordata (สัตว์มีแกนสันหลัง)
Class	Mammalia (สัตว์เลี้ยงลูกด้วยน้ำนม)	Elasmobranchii
Order	Carnivora (สัตว์กินเนื้อ)	Rajiformes (อันดับปลาโรนัน)
Family	Ursidae (Bears)	Arhynchobatidae
Genus	Ursus (Bears)	Brochiraja
Species	Ursus maritimus	Brochiraja spinifera

Evolutionary Relationship

Polar bear and Prickly deep-sea skate share a common ancestor at the Phylum level: Chordata. (สัตว์มีแกนสันหลัง)

Conservation Status

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

Prickly deep-sea skate

DD — Data Deficient

Physical Characteristics

Attribute	Polar bear	Prickly deep-sea skate
Diet	Carnivore	—
Average Lifespan	25 years	—
Average Length	2.4 m	—
Average Weight	450.0 kg	—

Habitat & Geographic Range

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.

Prickly deep-sea skate

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.