Buttonhead Pipewort vs European otter

Eriocaulon heterolepis compared with Lutra lutra

Key Differences

• Buttonhead Pipewort is Least Concern while European otter is Vulnerable.

Taxonomic Classification

Rank	Buttonhead Pipewort	European otter
Kingdom	Plantae (Plants)	Animalia (Animals)
Phylum	Magnoliophyta (Flowering Plants)	Chordata (Chordates)
Class	Liliopsida (Monocots)	Mammalia (Mammals)
Order	Poales (Grasses)	Carnivora (Carnivorans)
Family	Eriocaulaceae	Mustelidae (Weasels & Otters)
Genus	Eriocaulon	Lutra (Otters)
Species	Eriocaulon heterolepis	Lutra lutra

Conservation Status

Buttonhead Pipewort

LC — Least Concern

European otter

VU — Vulnerable

Trend: Stable →

Physical Characteristics

Attribute	Buttonhead Pipewort	European otter
Diet	—	Carnivore
Average Lifespan	—	10 years
Average Length	—	1.0 m
Average Weight	—	10.0 kg

Habitat & Geographic Range

Buttonhead Pipewort

Habitat

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

European otter

Habitat

Typically found in diverse ecosystems where prey species are available.

Range

Found across Europe (6 countries). Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Buttonhead Pipewort

The Buttonhead Pipewort (Eriocaulon heterolepis) is a species in the genus Eriocaulon. It is currently classified as Least Concern on the IUCN Red List. Typically found in grasslands, wetlands, forests, and cultivated landscapes.

European otter

Sleek semi-aquatic mustelid found along clean rivers, streams, and coastlines across Europe and Asia. European otters can reach 1.3 meters in length and are highly skilled fish hunters, using sensitive whiskers to detect prey movements. Requiring unpolluted water with abundant fish, they are an indicator species for freshwater ecosystem health. Once nearly extinct in Western Europe from hunting and pollution, populations have recovered significantly following water quality improvements.