bank swallow; Riparia riparia
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...(order Passeriformes). In America the name refers to the purple martin (
Progne subis) and its four tropical relatives—at 20 cm (8 inches) long, the largest American swallows. The
sand martin, or bank swallow (
Riparia riparia), a 12-centimetre (5-inch) brown and white bird, breeds throughout the Northern Hemisphere; it makes nest burrows in sandbanks. The house martin...