Larus robustus

Larus robustus is an extinct species of gull that lived during the Late Pleistocene.

Etymology
The genus name Larus derives from Ancient Greek, referring to a seabird. The species name robustus derives from Latin, meaning "hardness, strength."

Description
Larus robustus specimens stem from Fossil Lake, Oregon. Charles H. Sternberg collected the type specimen. Larus robustus is large gull, smaller than the glaucous gull (Larus hyperboreus) and significantly larger than the American herring gull (Larus argentatus smithsonianus).