Four-Barred Knapweed Gall Fly vs Polar bear

Urophora quadrifasciata compared with Ursus maritimus

Key Differences

• Four-Barred Knapweed Gall Fly is Not Evaluated while Polar bear is Vulnerable.

Taxonomic Classification

Rank	Four-Barred Knapweed Gall Fly	Polar bear
Kingdom same	Animalia (สัตว์)	Animalia (สัตว์)
Phylum	Arthropoda (สัตว์ขาปล้อง)	Chordata (สัตว์มีแกนสันหลัง)
Class	Insecta (แมลง)	Mammalia (สัตว์เลี้ยงลูกด้วยน้ำนม)
Order	Diptera (แมลงวัน)	Carnivora (สัตว์กินเนื้อ)
Family	Tephritidae	Ursidae (Bears)
Genus	Urophora	Ursus (Bears)
Species	Urophora quadrifasciata	Ursus maritimus

Evolutionary Relationship

Four-Barred Knapweed Gall Fly and Polar bear share a common ancestor at the Kingdom level: Animalia. (สัตว์)

Conservation Status

Four-Barred Knapweed Gall Fly

NE — Not Evaluated

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

Physical Characteristics

Attribute	Four-Barred Knapweed Gall Fly	Polar bear
Diet	—	Carnivore
Average Lifespan	—	25 years
Average Length	—	2.4 m
Average Weight	—	450.0 kg

Habitat & Geographic Range

Four-Barred Knapweed Gall Fly

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Belgium, Denmark, Sweden, and United States.

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.

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.