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Charadriiformes / Alcidae / Ptychoramphus

Cassin's Auklet

Ptychoramphus aleuticus

IUCN: Near Threatened

Data Sources

AviList 2025 eBird (casauk) Avibase

Taxonomy data from AviList 2025.

Taxonomy

Order: Charadriiformes
Family: Alcidae
Genus: Ptychoramphus

Subspecies (2)

Ptychoramphus aleuticus aleuticus

breeds Aleutian Islands and Alaska to northern Baja California; withdraws from north in winter
Ptychoramphus aleuticus australis

central Baja California (San Benito to Asunción and San Roque islands)

Data Sources

AviList 2025 eBird (casauk) Avibase

Taxonomy data from AviList 2025.