WordNet sense 1 (Old World warbler similar to the greater whitethroat but smaller):

lesser whitethroat, Sylvia curruca

WordNet sense 2 (greyish-brown Old World warbler with a white throat and underparts):

greater whitethroat, Sylvia communis

WordNet sense 3 (common North American finch with a white patch on the throat and black-and-white striped crown):

white-throated sparrow, Zonotrichia albicollis