Common Spike-Rush vs Polar bear

Eleocharis palustris compared with Ursus maritimus

Key Differences

Common Spike-Rush is Least Concern while Polar bear is Vulnerable.

Taxonomic Classification

Rank	Common Spike-Rush	Polar bear
Kingdom	Plantae (植物)	Animalia (动物界)
Phylum	Magnoliophyta (木兰植物门)	Chordata (脊索动物门)
Class	Liliopsida (百合纲)	Mammalia (哺乳動物)
Order	Poales (禾本目)	Carnivora (食肉目)
Family	Cyperaceae	Ursidae (Bears)
Genus	Eleocharis	Ursus (Bears)
Species	Eleocharis palustris	Ursus maritimus

Conservation Status

Common Spike-Rush

LC — Least Concern

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

Physical Characteristics

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

Habitat & Geographic Range

Common Spike-Rush

Habitat

Typically found in grasslands, wetlands, forests, and cultivated landscapes.

Range

Widely distributed across Europe (6 countries), North America (Canada, United States), and South America (Chile).

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 Spike-Rush

<em>Eleocharis palustris</em>, commonly known as the common spike-rush, is a perennial wetland sedge in the family Cyperaceae, broadly distributed across the temperate and boreal regions of the Northern Hemisphere. This species typically inhabits shallow freshwater marshes, pond margins, riverbanks, wet meadows, ditches, and other seasonally or permanently flooded habitats, tolerating a range of water depths and soil conditions. Its geographic range spans Europe, Asia, and North America, extending from subarctic regions southward into subtropical zones. Classified as Least Concern on the IUCN Red List, <em>Eleocharis palustris</em> is among the most ecologically widespread wetland plant species globally. It forms dense stands via rhizomatous growth, providing important cover, nesting sites, and food resources for waterfowl and invertebrates. The plant produces leafless green culms up to approximately 60 cm tall, bearing a single terminal spikelet. As a plant, dietary traits in the animal sense are not applicable. Biological traits such as average individual lifespan, body dimensions in the zoological sense, and body weight remain poorly documented, as these metrics are not typically applied to non-vascular measurements in this genus. The species plays a critical ecological role in stabilising wetland sediments and maintaining water quality.