Salangana Polinesia Aerodramus leucophaeus

A medium-sized swiftlet with a relatively long forked tail. Mostly brown with very slightly paler brown underparts and a more golden-brown rump. Most common over rocky riverine valleys and humid forests. Similar to Atiu Swiftlet but is less contrastingly patterned, overall more uniformly brown, with a paler rump and a proportionally longer tail. Also extremely similar to Marquesan Swiftlet, but appears paler-faced and lacks a pale collar. Call is an insect-like buzzing and trilling.