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Genus Actitis
Common Sandpiper - The Common Sandpiper, Actitis hypoleucos, is a small Palearctic wader. This bird and its American sister species, the Spotted Sandpiper , make up the genus Actitis. They are parapatric and replace each other geographically; stray birds of either species may settle down with breeders of the other and hybridize. Hybridization has also been reported between the Common Sandpiper and the Green Sandpiper, a basal species of the closely related shank genus Tringa.
Spotted Sandpiper - The Spotted Sandpiper is a small shorebird, 18–20 cm long. Together with its sister species, the Common Sandpiper they make up the genus Actitis. They replace each other geographically; stray birds may settle down with breeders of the other species and hybridize.