Dwarf round ray vs Laysan Duck

Urotrygon nana compared with Anas laysanensis

Key Differences

• Dwarf round ray is Near Threatened while Laysan Duck is Critically Endangered.

Taxonomic Classification

Rank	Dwarf round ray	Laysan Duck
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Elasmobranchii	Aves (Birds)
Order	Myliobatiformes (Myliobatiformes)	Anseriformes (Anseriformes)
Family	Urotrygonidae	Anatidae
Genus	Urotrygon	Anas
Species	Urotrygon nana	Anas laysanensis

Evolutionary Relationship

Dwarf round ray and Laysan Duck share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Dwarf round ray

NT — Near Threatened

Laysan Duck

CR — Critically Endangered

Physical Characteristics

Attribute	Dwarf round ray	Laysan Duck
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Dwarf round ray

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.

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.