Schemes including Larus canus

• eBird/Clements Checklist 6.8 Larus canus
• IUCN Red List of Threatened Species. Version 2012.1 Larus canus
• eBird/Clements Checklist 6.7 Larus canus
• IUCN Red List of Threatened Species. Version 2012.2 (106003216) Larus canus
• CONABIO (189243AVESB501112) Larus canus
• NatureServe Explorer: An online encyclopedia of life. Version 7.1 (ELEMENT_GLOBAL.2.100425) Larus canus
• eBird/Clements Checklist 6.9 Larus canus
• GBIF (2481187) Larus canus
• eBird/Clements Checklist v2017 Larus canus