Светлобрюхий тиранн-плакса Rhytipterna immunda

Medium-sized, dull flycatcher; resembles a Myiarchus but has smaller bill, rounder head, and little contrast between breast and belly. Locally distributed and poorly known; found in seasonally inundated and scrub woodlands on weathered white sands. Inconspicuous and best located by voice; behaves sluggishly, sallying to foliage for insects; also eats fruit. May be found alone or in loose association with other species. Distinctive voice is a rich, slurred whistle, Schiffornis-like in quality and unlike any other species in habitat.