Raie d'eau douce vs ours blanc

Potamotrygon hystrix compared with Ursus maritimus

Key Differences

• Raie d'eau douce is Data Deficient while ours blanc is Vulnerable.

Taxonomic Classification

Rank	Raie d'eau douce	ours blanc
Kingdom same	Animalia (animal)	Animalia (animal)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Elasmobranchii	Mammalia (mammifères)
Order	Myliobatiformes (Myliobatiformes)	Carnivora (carnivores)
Family	Potamotrygonidae	Ursidae (Bears)
Genus	Potamotrygon	Ursus (Bears)
Species	Potamotrygon hystrix	Ursus maritimus

Evolutionary Relationship

Raie d'eau douce and ours blanc share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Raie d'eau douce

DD — Data Deficient

ours blanc

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

Physical Characteristics

Attribute	Raie d'eau douce	ours blanc
Diet	—	Carnivore
Average Lifespan	—	25 years
Average Length	—	2.4 m
Average Weight	—	450.0 kg

Habitat & Geographic Range

Raie d'eau douce

ours blanc

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.

ours blanc

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.