Common Awl-fly vs Polar bear

Xylophagus ater compared with Ursus maritimus

Key Differences

• Common Awl-fly is Least Concern while Polar bear is Vulnerable.

Taxonomic Classification

Rank	Common Awl-fly	Polar bear
Kingdom same	Animalia (动物界)	Animalia (动物界)
Phylum	Arthropoda (节肢动物门)	Chordata (脊索动物门)
Class	Insecta (昆蟲綱)	Mammalia (哺乳動物)
Order	Diptera (雙翅目)	Carnivora (食肉目)
Family	Xylophagidae	Ursidae (Bears)
Genus	Xylophagus	Ursus (Bears)
Species	Xylophagus ater	Ursus maritimus

Evolutionary Relationship

Common Awl-fly and Polar bear share a common ancestor at the Kingdom level: Animalia. (动物界)

Conservation Status

Common Awl-fly

LC — Least Concern

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

Physical Characteristics

Attribute	Common Awl-fly	Polar bear
Diet	—	Carnivore
Average Lifespan	—	25 years
Average Length	—	2.4 m
Average Weight	—	450.0 kg

Habitat & Geographic Range

Common Awl-fly

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Belgium, Denmark, Norway, and Sweden.

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.

Common Awl-fly

<em>Xylophagus ater</em>, commonly known as the Common Awl Fly, is a dipteran insect in the family Xylophagidae. This species is assessed as Least Concern on the IUCN Red List and is distributed across parts of northern and western Europe, with records from Belgium, Denmark, Norway, and Sweden. The larvae of Common Awl Flies are typically found in decaying wood and moist, rotting logs, where they develop as predators of other wood-inhabiting invertebrate larvae. This saproxylic association makes the species dependent on the availability of large-diameter deadwood in forest habitats. Adults are slender, dark flies resembling small robber flies, and they are typically encountered in woodland environments near their larval habitats. As saproxylic insects, Common Awl Flies play an important role in forest nutrient cycling by contributing to the decomposition of dead wood. Their presence in a habitat often indicates a relatively undisturbed forest ecosystem with sufficient deadwood resources. Biological traits of this species remain poorly documented in the scientific literature.

Polar bear

北极熊是地球上最大的陆地食肉动物，体重可超过700千克，分布于从加拿大到俄罗斯的北极海冰区。是高度特化的海洋哺乳动物，依赖海冰捕猎环斑海豹和髯海豹。是优秀的游泳者，能够横渡广阔的开阔水域。被列为易危种，因气候变化导致北极海冰迅速减少，种群正受到严重威胁。

Shared Countries

Both species can be found in 1 countries:

🇳🇴 Norway