Alston s Cotton Rat vs Common Eider

Sigmodon alstoni compared with Somateria mollissima

Key Differences

• Alston s Cotton Rat is Least Concern while Common Eider is Near Threatened.

Taxonomic Classification

Rank	Alston s Cotton Rat	Common Eider
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Mammalia (Mammals)	Aves (Birds)
Order	Rodentia (Rodents)	Anseriformes (Anseriformes)
Family	Cricetidae	Anatidae
Genus	Sigmodon	Somateria
Species	Sigmodon alstoni	Somateria mollissima

Evolutionary Relationship

Alston s Cotton Rat and Common Eider share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Alston s Cotton Rat

LC — Least Concern

Common Eider

NT — Near Threatened

Physical Characteristics

Attribute	Alston s Cotton Rat	Common Eider
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Alston s Cotton Rat

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Distributed across Colombia and Venezuela.

Common Eider

Habitat

Typically found in various aerial, terrestrial, and aquatic environments.

Range

Found across Europe (5 countries) and North America (United States). Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

Alston s Cotton Rat

The Alston s Cotton Rat (Sigmodon alstoni) is a species in the genus Sigmodon. It is currently classified as Least Concern on the IUCN Red List. Typically found in diverse terrestrial and aquatic ecosystems. Distributed across Colombia and Venezuela.

Common Eider

Common Eider (Somateria mollissima) is classified as Near Threatened (NT) on the IUCN Red List. Close to qualifying as threatened, with populations that may become vulnerable without conservation action.