Common sawfly vs Polar bear

Hoplocampa brevis compared with Ursus maritimus

Key Differences

Common sawfly is Not Evaluated while Polar bear is Vulnerable.

Taxonomic Classification

Rank	Common sawfly	Polar bear
Kingdom same	Animalia (動物)	Animalia (動物)
Phylum	Arthropoda (節足動物)	Chordata (脊索動物)
Class	Insecta (昆虫)	Mammalia (哺乳類)
Order	Hymenoptera (ハチ目)	Carnivora (ネコ目)
Family	Tenthredinidae	Ursidae (Bears)
Genus	Hoplocampa	Ursus (Bears)
Species	Hoplocampa brevis	Ursus maritimus

Evolutionary Relationship

Common sawfly and Polar bear share a common ancestor at the Kingdom level: Animalia. (動物)

表示 Kingdom: Animalia

Conservation Status

Common sawfly

NE — Not Evaluated

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

Physical Characteristics

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

Habitat & Geographic Range

Common sawfly

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Found across Europe (7 countries) and North America (Canada, 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.

Common sawfly

<em>Hoplocampa brevis</em>, the plum sawfly or common sawfly, is a hymenopteran insect in the family Tenthredinidae. The species is distributed across Europe and has been introduced to parts of North America, with records from Canada and the United States, typically in association with commercial plum and cherry orchards. Adults are small, wasp-like insects approximately 4–5 millimeters in length, with pale yellow-brown coloration. Females lay eggs inside flower buds of <em>Prunus</em> species during blossoming, and the hatching larvae burrow into developing fruitlets, feeding on the contents before exiting to pupate in the soil. Larval feeding causes fruitlets to drop prematurely, and infestations can cause economically significant losses in plum and damson production. The species is not currently evaluated on the IUCN Red List. Adults feed on nectar and pollen, and the species typically produces one generation per year, with adults emerging in spring coinciding with the blossoming period of host trees. The larvae are creamy white with a brownish head capsule and produce a distinctive, unpleasant odor when disturbed. Biological traits such as average lifespan, body weight, and detailed non-larval dietary composition remain poorly documented in standardized ecological databases.

Polar bear

地球上で最大の陸上肉食動物であるホッキョクグマは700kgを超えることがあり、カナダからロシアまでの北極海氷域全体に分布する。ワモンアザラシとヒゲアザラシを狩るために海氷に依存する高度に特化した海洋哺乳類である。広大な距離を泳ぐことができる優れた泳者でもある。脆弱種に指定されており、気候変動による急激な北極海氷の消失で個体群が深刻な圧力を受けている。