Южноамериканская цапля Ardea cocoi

Large and lanky with gray-blue back, white neck, and black cap. Widespread and conspicuous (though not abundant) in marshes, rivers, and lakes from Panama to southernmost Chile and Argentina, usually at low elevations. Can be seen singly or in congregations with other herons. Where range overlaps with Great Blue Heron, look for white neck and more extensive black cap.