Crested Oval Sedge vs Laysan Duck

Carex cristatella compared with Anas laysanensis

Key Differences

• Crested Oval Sedge is Extinct while Laysan Duck is Critically Endangered.

Taxonomic Classification

Rank	Crested Oval Sedge	Laysan Duck
Kingdom	Plantae (Plants)	Animalia (Animals)
Phylum	Magnoliophyta (Flowering Plants)	Chordata (Chordates)
Class	Liliopsida (Monocots)	Aves (Birds)
Order	Poales (Grasses)	Anseriformes (Anseriformes)
Family	Cyperaceae	Anatidae
Genus	Carex	Anas
Species	Carex cristatella	Anas laysanensis

Conservation Status

Crested Oval Sedge

EX — Extinct

Laysan Duck

CR — Critically Endangered

Physical Characteristics

Attribute	Crested Oval Sedge	Laysan Duck
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Crested Oval Sedge

Habitat

Typically found in grasslands, wetlands, forests, and cultivated landscapes.

Range

Distributed across Canada and United States.

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.