Button-Willow vs European otter

Cephalanthus occidentalis compared with Lutra lutra

Key Differences

Button-Willow is Least Concern while European otter is Vulnerable.

Taxonomic Classification

Rank	Button-Willow	European otter
Kingdom	Plantae (Plants)	Animalia (Animals)
Phylum	Magnoliophyta (Flowering Plants)	Chordata (Chordates)
Class	Magnoliopsida (Dicots)	Mammalia (Mammals)
Order	Gentianales (Gentianales)	Carnivora (Carnivorans)
Family	Rubiaceae	Mustelidae (Weasels & Otters)
Genus	Cephalanthus	Lutra (Otters)
Species	Cephalanthus occidentalis	Lutra lutra

Conservation Status

Button-Willow

LC — Least Concern

European otter

VU — Vulnerable

Trend: Stable →

Physical Characteristics

Attribute	Button-Willow	European otter
Diet	—	Carnivore
Average Lifespan	—	10 years
Average Length	—	1.0 m
Average Weight	—	10.0 kg

Habitat & Geographic Range

Button-Willow

Habitat

Typically found in diverse terrestrial habitats from tropical forests to temperate regions.

Range

Distributed across Norway and United States.

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.

Button-Willow

The Button-Willow (Cephalanthus occidentalis) is a species in the genus Cephalanthus. It is currently classified as Least Concern on the IUCN Red List. Typically found in diverse terrestrial habitats from tropical forests to temperate regions.

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.