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 River martins, Pseudochelidon 

'''The river martins form a distinctive subfamily. The two species are the African River Martin Pseudochelidon eurystomina, and the White-eyed River Martin Pseudochelidon sirintarae. These are medium-sized, largely black swallows that have a light buoyant flight and feed on insects caught in the air. They appear to be more terrestrial than other swallows, frequently walking rather than perching.'''