Larus perpetuus

Larus perpetuus is an extinct species of gull that lived in North America during the Pliocene.

Etymology
The genus name Larus derives from Ancient Greek, referring to a seabird. The species name perpetuus derives from Latin, meaning constant or forever, referencing the "long fossil history of this species."

Description
Larus perpetuus specimens stem from Sarasota County, Florida (Late Pliocene), and Beaufort County, North Carolina (Early Pliocene). Its bone structure most closely resembles the black-tailed gull (Larus crassirostris), ring-billed gull (Larus delawarensis), and Audouin's gull (Ichthyaetus audouinii; formerly Larus audouinii).