Amazonian Marsh Rat vs Common Eider

Holochilus sciureus compared with Somateria mollissima

Key Differences

• Amazonian Marsh Rat is Least Concern while Common Eider is Near Threatened.

Taxonomic Classification

Rank	Amazonian Marsh 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	Holochilus	Somateria
Species	Holochilus sciureus	Somateria mollissima

Evolutionary Relationship

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

Conservation Status

Amazonian Marsh Rat

LC — Least Concern

Common Eider

NT — Near Threatened

Physical Characteristics

Attribute	Amazonian Marsh Rat	Common Eider
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Amazonian Marsh 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.

Amazonian Marsh Rat

The Amazonian Marsh Rat (Holochilus sciureus) is a species in the genus Holochilus. It is currently classified 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.