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| Subspecies: | Unknown |
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| Est. World Population: | 350000 |
| CITES Status: | NOT LISTED |
| IUCN Status: | Near Threatened |
| U.S. ESA Status: | NOT LISTED |
| Body Length: | |
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| Jumping Ability: | (Horizontal) |
| Life Span: | in the Wild |
| Life Span: | in Captivity |
| Sexual Maturity: | (Females) |
| Sexual Maturity: | (Males) |
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Larus heermanni has a population of approximately 283,000 to 300,000 breeding adults (Kushlan et al. 2002), 92% of which nest on Isla Rasa, Mexico (Burger and Gochfeld 1996). There are 150 pairs on George Island, 1,500 on Cholluda (Burger and Gochfeld 1996), 4,000 on Cardonosa and 200 breeding individuals on San Il de Fonso (Velarde 1999), with breeding south to Nayarit and islas San Benito and San Roque, and sporadically north to California, U.S.A. (Everett and Anderson 1991, Burger and Gochfeld 1996). Post-breeding dispersal occurs commonly to central California and in smaller numbers north to British Columbia, Canada, and south to Guatemala (Burger and Gochfeld 1996). Numbers on Isla Rasa are similar to estimates in the late 1960s, but there have been significant fluctuations with a low of 55,000 pairs in 1975 (Burger and Gochfeld 1996).
No specific actions are known.
Conservation and Research Actions ProposedContinue to take active measures to protect breeding populations on islands, particularly Isla Rasa. Monitor population trends at breeding sites, particularly in response to climatic change or fluctuation.