Flat Periwinkle vs Red-billed Duck

Littorina obtusata compared with Anas erythrorhyncha

Taxonomic Classification

Rank	Flat Periwinkle	Red-billed Duck
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Mollusca (Mollusks)	Chordata (Chordates)
Class	Gastropoda (Gastropoda)	Aves (Birds)
Order	Littorinimorpha (Littorinimorpha)	Anseriformes (Anseriformes)
Family	Littorinidae	Anatidae
Genus	Littorina	Anas
Species	Littorina obtusata	Anas erythrorhyncha

Evolutionary Relationship

Flat Periwinkle and Red-billed Duck share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

Flat Periwinkle

LC — Least Concern

Red-billed Duck

LC — Least Concern

Physical Characteristics

Attribute	Flat Periwinkle	Red-billed Duck
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Flat Periwinkle

Habitat

Typically found in terrestrial and aquatic habitats including forests and freshwater.

Range

Distributed across Belgium, Denmark, Norway, and Sweden.

Red-billed Duck

Habitat

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

Range

Found across Europe (6 countries) and South America (Ecuador).

Red-billed Duck

Red-billed Duck (Anas erythrorhyncha) 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 2 countries:

🇧🇪 Belgium 🇳🇴 Norway