Larus oregonusLarus oregonus is an extinct species of gull that lived during the Late Pleistocene.EtymologyThe genus name Larus derives from Ancient Greek, referring to a seabird. The species name oregonus derives from Oregon, the state where Edward Drinker Cope collected the type specimen.DescriptionLarus oregonus specimens stem from Fossil Lake, Oregon and Camp Cady, California. Larus oregonus is about the same size as the ring-billed gull.