Until 2016 the black-faced grassquit Tiaris bicolor was officially classified with other passerine emberizidae (e.g. antillean bullfinches & sundry New World sparrows).  The classifications committee of the American Ornithological Union recently moved them to join tanager-type species, specifically the dome-nesting ones. Now they are considered to be closely related to Darwin’s finches; and they join the broader category that includes tanagers, grosbeaks, and buntings. 

All photographs taken on Abaco, as credited below

THE BFG EVERYDAY TWITTERING SONG 

THE BFG DISPLAY BUZZING SONG 

Credits: Alex Hughes (1, 10); Tom Sheley (2, 3); Bruce Hallett (4, 9); Tom Reed (5, 11); Becky Marvil (6); Peter Mantle (7); Gerlinde Taurer (8); Keith Salvesen (12); Whatbird? (sound files)