the world > animals > birds > order Passeriformes (singing) > non-arboreal (larks, etc.) > [noun] > family Hirundinidae > genus Petrochelidan > other types of (2)
an Australian martin, Petrochelidon (or Hirundo) ariel, which has a reddish-brown crown, dark back, and whitish underparts.
(a) an Australian swallow of the genus Hylochelidon, which lays in holes in trees; (b) the North American white-bellied or white-breasted swallow, T…