In fact virtually every bluff shelter or cave entrance of any size will have a mossy phoebe nest anchored in a sheltered area. Bridges also are favorite phoebe hangouts. The Acadian flycatcher is more commonly heard than seen. This little flycatcher arrives in May and hunts and sings from the middle layers of streamside trees. Learning its startled, quick whistle is the best way to identify it.
Swallows also hunt flying insects.
The most common species of swallow on the river is the brown and white northern rough-winged swallow. Rough-wings nest in the nooks and crannies of bluffs and cave entrances. Several of the earliest arriving warblers are river birds, including the prothonotary and yellow-throated warblers, the northern parula and the Louisiana waterthrush. Waterthrushes are also warblers, but their ground-dwelling habits and brown plumage are thrushlike. What the waterthrush lacks in color, it makes up for with its beautiful song-three clear, sweet notes followed by a descending jumble of twittering notes.