Arizona Cotton Rat vs Common Eider

Sigmodon arizonae compared with Somateria mollissima

Key Differences

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

Taxonomic Classification

Rank	Arizona 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 arizonae	Somateria mollissima

Evolutionary Relationship

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

Conservation Status

Arizona Cotton Rat

LC — Least Concern

Common Eider

NT — Near Threatened

Physical Characteristics

Attribute	Arizona Cotton Rat	Common Eider
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Arizona Cotton Rat

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

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.

Arizona Cotton Rat

The Arizona Cotton Rat, Sigmodon arizonae, is a species. It is currently assessed as least concern on the IUCN Red List. Typically found in diverse terrestrial and aquatic ecosystems.

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.