Northern Birch Mouse vs St. James' shell

Sicista betulina compared with Pecten maximus

Taxonomic Classification

Rank	Northern Birch Mouse	St. James' shell
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Chordata (Chordates)	Mollusca (Mollusks)
Class	Mammalia (Mammals)	Bivalvia (Bivalvia)
Order	Rodentia (Rodents)	Pectinida (Pectinida)
Family	Dipodidae	Pectinidae
Genus	Sicista	Pecten
Species	Sicista betulina	Pecten maximus

Evolutionary Relationship

Northern Birch Mouse and St. James' shell share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

Northern Birch Mouse

LC — Least Concern

St. James' shell

LC — Least Concern

Physical Characteristics

Attribute	Northern Birch Mouse	St. James' shell
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Northern Birch Mouse

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Distributed across Denmark, Norway, Russia, Sweden, and Ukraine.

St. James' shell

Habitat

Native to Asia and Europe and South America, inhabiting ecosystems characteristic of the region.

Range

Widely distributed across Asia (China), Europe (8 countries), and South America (Chile).

St. James' shell

St. James' shell (Pecten maximus) is classified as Least Concern (LC) on the IUCN Red List. Widespread and abundant across its range, with stable populations and no immediate conservation concerns.

Shared Countries

Both species can be found in 3 countries:

🇩🇰 Denmark 🇳🇴 Norway 🇸🇪 Sweden