Animalia > Chordata > Aves > Charadriiformes > Alcidae > Ptychoramphus > Ptychoramphus aleuticus

Ptychoramphus aleuticus (Cassin's Auklet)

Synonyms: Ptychoramphus aleutica
Language: Spanish

Wikipedia Abstract

Cassin’s auklet (Ptychoramphus aleuticus) is a small, chunky seabird that ranges widely in the North Pacific. It nests in small burrows and because of its presence on well studied islands in British Columbia and off California it is one of the better known auks. It is named for John Cassin, a Pennsylvania businessman and naturalist. It is divided into two subspecies: \n* P. a. aleuticus – (Pallas, 1811): Aleutian Islands & south Alaska to northern Baja California. \n* P. a. australis – (van Rossem, 1939): southern Baja California.
View Wikipedia Record: Ptychoramphus aleuticus


EDGE Analysis

Uniqueness Scale: Similiar (0) 
 Unique (100)
Uniqueness & Vulnerability Scale: Similiar & Secure (0) 
 Unique & Vulnerable (100)
ED Score: 8.25275
EDGE Score: 2.22492


Adult Weight [1]  177 grams
Birth Weight [3]  18 grams
Breeding Habitat [2]  Coastal cliffs and islands, Coastal marine
Wintering Geography [2]  Pacific Coast
Wintering Habitat [2]  Coastal marine
Diet [4]  Carnivore (Invertebrates), Piscivore
Diet - Fish [4]  30 %
Diet - Invertibrates [4]  70 %
Forages - Underwater [4]  100 %
Female Maturity [1]  3 years
Male Maturity [6]  2 years
Clutch Size [1]  1
Global Population (2017 est.) [2]  3,600,000
Incubation [1]  39 days
Maximum Longevity [1]  20 years
Migration [5]  Intracontinental
Wing Span [7]  17 inches (.441 m)


Name Countries Ecozone Biome Species Report Climate Land
Baja California desert Mexico Nearctic Deserts and Xeric Shrublands
California coastal sage and chaparral Mexico, United States Nearctic Mediterranean Forests, Woodlands, and Scrub

Protected Areas

Important Bird Areas

Biodiversity Hotspots

Name Location Endemic Species Website
California Floristic Province Mexico, United States No

Prey / Diet

Prey / Diet Overlap


Bubo scandiacus (Snowy Owl)[8]
Eumetopias jubatus (Steller Sea Lion)[8]
Falco peregrinus (Peregrine Falcon)[8]
Homo sapiens (man)[8]
Larus glaucescens (Glaucous-winged Gull)[8]


Parasitized by 
Actenopsylla suavis[11]

Range Map


North America;

External References



Attributes / relations provided by
1Comparative Reproductive Ecology of the Auks (Family Alcidae) with Emphasis on the Marbled Murrelet, Toni L. De Santo, S. Kim Nelson, USDA Forest Service Gen. Tech. Rep. PSW-152. 1995. pp. 33-47
2Partners in Flight Avian Conservation Assessment Database, version 2017. Accessed on January 2018.
3del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.
4Hamish Wilman, Jonathan Belmaker, Jennifer Simpson, Carolina de la Rosa, Marcelo M. Rivadeneira, and Walter Jetz. 2014. EltonTraits 1.0: Species-level foraging attributes of the world's birds and mammals. Ecology 95:2027
5Myers, P., R. Espinosa, C. S. Parr, T. Jones, G. S. Hammond, and T. A. Dewey. 2006. The Animal Diversity Web (online). Accessed February 01, 2010 at
6de Magalhaes, J. P., and Costa, J. (2009) A database of vertebrate longevity records and their relation to other life-history traits. Journal of Evolutionary Biology 22(8):1770-1774
7Anatomy and Histochemistry of Flight Muscles in a Wing-Propelled Diving Bird, the Atlantic Puffin, Fratercula arctica, Christopher E. Kovacs and Ron A. Meyers, JOURNAL OF MORPHOLOGY 244:109–125 (2000)
8Jorrit H. Poelen, James D. Simons and Chris J. Mungall. (2014). Global Biotic Interactions: An open infrastructure to share and analyze species-interaction datasets. Ecological Informatics.
9Szoboszlai AI, Thayer JA, Wood SA, Sydeman WJ, Koehn LE (2015) Forage species in predator diets: synthesis of data from the California Current. Ecological Informatics 29(1): 45-56. Szoboszlai AI, Thayer JA, Wood SA, Sydeman WJ, Koehn LE (2015) Data from: Forage species in predator diets: synthesis of data from the California Current. Dryad Digital Repository.
10Ocean climate, euphausiids and auklet nesting: inter-annual trends and variation in phenology, diet and growth of a planktivorous seabird, Ptychoramphus aleuticus, Christine L. Abraham, William J. Sydeman, MARINE ECOLOGY PROGRESS SERIES, Vol. 274: 235–250, 2004
11International Flea Database
Ecoregions provided by World Wide Fund For Nature (WWF). WildFinder: Online database of species distributions, ver. 01.06 WWF WildFINDER
Biodiversity Hotspots provided by Critical Ecosystem Partnership Fund
Abstract provided by DBpedia licensed under a Creative Commons License