Comments: Composed of three groups: brachyrhynchus of North America (Short-billed Gull), canus of Eurasia (Mew Gull), and kamtschatschensis of Siberia (Kamchatka Gull) (AOU 1998). Some authors suggest that the larger Asiatic form, which has been reported from the western Aleutians, is a separate species, L. kamtschatschensis (AOU 1983). Populations on Asian and North American sides of Beringia exhibit mtDNA differentiation consistent with species-level distinctness (Zink et al. 1995); because sample sizes were small, Zink et al. (1995) did not recommend a formal taxonomic change. Known as Common Gull in Europe (Jonsson 1992).