Plate 155 – Black-throated Blue Warbler

It is possible to hear the “Chewp” and “Tsip” calls and rising zwee-zwee-zwee song of the Black-throated Blue warbler in only the quietest surroundings. How much quieter would the surroundings need to be for John James Audubon to hear the bird foraging? “The Black-throated Blue Warbler is an expert catcher of flies, pursues insects to a considerable distance in all directions, and in seizing them snaps its bill so as to produce a clicking sound.”