Turnstones are the bird species in the genus Arenaria in the family Scolopacidae.
Both birds are distinctive medium-sized waders. They are high Arctic breeders, and are migratory. These chunky powerful birds have strong necks and bills well suited to their feeding technique. As the name implies, these species readily turn stones or seaweed looking for hidden invertebrates. They are strictly coastal, preferring stony beaches to sand, and are often found with other waders such as Purple Sandpipers.
Their appearance is striking in flight, with white patches on the back, wings and tail.