The square-tailed saw-wing (Psalidoprocne nitens), also known as the square-tailed rough-winged swallow, is a species of bird in the family Hirundinidae. It is native to the African tropical rainforest.
Description It is dark green, almost black.
Subspecies There are currently two recognised subspecies. P. n. nitens, the nominate subspecies, which occurs in Guinea, Sierra Leone, Ivory Coast, Ghana, Togo, Nigeria, Gabon, Congo and Angola. P. n. centralis, which occurs in northeast Democratic Republic of the Congo.
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