Deer Mouse vs Otter, Fischotter

Peromyscus maniculatus compared with Lutra lutra

Key Differences

• Deer Mouse is Least Concern while Otter, Fischotter is Vulnerable.

Taxonomic Classification

Rank	Deer Mouse	Otter, Fischotter
Kingdom same	Animalia (Tier)	Animalia (Tier)
Phylum same	Chordata (Chordatiere)	Chordata (Chordatiere)
Class same	Mammalia (Säugetiere)	Mammalia (Säugetiere)
Order	Rodentia (Nagetiere)	Carnivora (Raubtiere)
Family	Cricetidae	Mustelidae (Weasels & Otters)
Genus	Peromyscus	Lutra (Otters)
Species	Peromyscus maniculatus	Lutra lutra

Evolutionary Relationship

Deer Mouse and Otter, Fischotter share a common ancestor at the Class level: Mammalia. (Säugetiere)

Conservation Status

Deer Mouse

LC — Least Concern

Otter, Fischotter

VU — Vulnerable

Trend: Stable →

Physical Characteristics

Attribute	Deer Mouse	Otter, Fischotter
Diet	—	Carnivore
Average Lifespan	—	10 years
Average Length	—	1.0 m
Average Weight	—	10.0 kg

Habitat & Geographic Range

Deer Mouse

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Found in United States.

Otter, Fischotter

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.

Otter, Fischotter

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.