Larus robustusLarus robustus 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 robustus derives from Latin, meaning "hardness, strength."DescriptionLarus robustus specimens stem from Fossil Lake, Oregon. Charles H. Sternberg collected the type specimen. Larus robustus is large gull, smaller than the glaucous gull and significantly larger than the American herring gull.