Laysan Duck vs ribbed grass snail

Anas laysanensis compared with Vallonia costata

Key Differences

• Laysan Duck is Critically Endangered while ribbed grass snail is Least Concern.

Taxonomic Classification

Rank	Laysan Duck	ribbed grass snail
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Chordata (Chordates)	Mollusca (Mollusks)
Class	Aves (Birds)	Gastropoda (Gastropoda)
Order	Anseriformes (Anseriformes)	Stylommatophora (Stylommatophora)
Family	Anatidae	Valloniidae
Genus	Anas	Vallonia
Species	Anas laysanensis	Vallonia costata

Evolutionary Relationship

Laysan Duck and ribbed grass snail share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

Laysan Duck

CR — Critically Endangered

ribbed grass snail

LC — Least Concern

Physical Characteristics

Attribute	Laysan Duck	ribbed grass snail
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Laysan Duck

Habitat

Found across multiple habitat types including temperate broadleaf and mixed forests, temperate coniferous forests, and Mediterranean forests and woodlands within the Palearctic biogeographic realm. Populations are also found in montane and highland environments at higher elevations.

Range

Distributed across Belgium, France, Netherlands, Norway, and United Kingdom. Currently classified as Critically Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

ribbed grass snail

Habitat

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

Range

Widely distributed across Africa (South Africa), Asia (Israel), Europe (9 countries), North America (Mexico, United States), Oceania and the Pacific (New Zealand), and South America (Chile).

Laysan Duck

Laysan Duck (Anas laysanensis) is classified as Critically Endangered (CR) on the IUCN Red List. Facing an extremely high risk of extinction in the wild due to severe population decline and habitat loss.

Shared Countries

Both species can be found in 3 countries:

🇧🇪 Belgium 🇫🇷 France 🇳🇴 Norway