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Cassin's Auklet Life History


Habitat OceansBack to top


Food Aquatic invertebratesBack to top


Nest Burrow

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Behavior Surface DiveDives underwater to capture prey, using its wings to swim.Back to top


Conservation Low ConcernThere is little information on population trends of Cassin's Auklet, but the species appears to be declining. Cassin's Auklet is listed as Near Threatened on the IUCN Red List. Colonies are threatened by predators, especially introduced predators (cats, fox, rats), and grazing animals (goats). The species is also vulnerable to the effects of climate change such as coastal upwelling systems. The North American Waterbird Conservation Plan estimates a continental population of 3.2 to 3.57 million birds and lists it as a Species of Moderate Concern. It rates an 11 out of 20 on the Continental Concern Score. Cassin's Auklet is not on the 2016 State of North America's Birds Watch List. Back to top


Ainley, David G., D. A. Manuwal, Josh Adams and A. C. Thoresen. (2011). Cassin's Auklet (Ptychoramphus aleuticus), version 2.0. In The Birds of North America (P. G. Rodewald, editor). Cornell Lab of Ornithology, Ithaca, New York, USA.

Kushlan, J. A., M. J. Steinkamp, K. C. Parsons, J. Capp, M. A. Cruz, M. Coulter, I. Davidson, L. Dickson, N. Edelson, R. Elliott, R. M. Erwin, S. Hatch, S. Kress, R. Milko, S. Miller, K. Mills, R. Paul, R. Phillips, J. E. Saliva, W. Sydeman, J. Trapp, J. Wheeler and K. Wohl (2002). Waterbird conservation for the Americas: The North American waterbird conservation plan, version 1. Washington, DC, USA.

Lutmerding, J. A. and A. S. Love. (2020). Longevity records of North American birds. Version 2020. Patuxent Wildlife Research Center, Bird Banding Laboratory 2020.

Sibley, D. A. (2014). The Sibley Guide to Birds, second edition. Alfred A. Knopf, New York, NY, USA.

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