Saskatchewan River, Canada.
Genetic data#R support suggestion that present species and S. trudeaui are sister-species; the two may be part of a monophyletic S. hirundo group#R (which see). W and inland populations sometimes separated as a geographical race, litoricola, but differences from other populations considered insufficient. Monotypic.
SE British Columbia S to Californian coast and E to S Ontario, Great Lakes, and New Jersey to North Carolina; Gulf coast from Alabama to NE Mexico (Tamaulipas). Winters from California and S New Jersey to S Mexico and Gulf of Honduras, rarely to Panama.
Food and feeding
Status and conservation
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