The Pine Warbler, Dendroica pinus, is a small songbird of the New World warbler family. These birds have white bellies, white wing bars, dark legs and thin, relatively long pointed bills; they have yellowish lines over their eyes. Adult males have olive upperparts and bright yellow throats and breasts; females and immatures display upperparts which are olive-brown. Their throats and breasts are paler. The song of this bird is a musical trill. Their calls are slurred chips.