Common Eider vs Formosan Serow

Somateria mollissima compared with Capricornis swinhoei

Key Differences

• Common Eider is Near Threatened while Formosan Serow is Least Concern.

Taxonomic Classification

Rank	Common Eider	Formosan Serow
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Aves (Birds)	Mammalia (Mammals)
Order	Anseriformes (Anseriformes)	Artiodactyla (Even-toed Ungulates)
Family	Anatidae	Bovidae (Bovids)
Genus	Somateria	Capricornis
Species	Somateria mollissima	Capricornis swinhoei

Evolutionary Relationship

Common Eider and Formosan Serow share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Common Eider

NT — Near Threatened

Formosan Serow

LC — Least Concern

Physical Characteristics

Attribute	Common Eider	Formosan Serow
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

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.

Formosan Serow

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Found in Taiwan.

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.