Tiny flycatcher, more often heard than seen. In addition to tiny size, note elongated crown feathers (usually held flat) and plain underparts. Found in a variety of forest types, especially those on sandy soils. May be alone or in pairs; perches well inside dense vegetation, usually at lower levels but occasionally into subcanopy. Sits still and darts upward to foliage for insect prey. Song is a hard, buzzing trill, repeated over and over and with little geographic variation. Similar to Helmeted Pygmy-Tyrant and often found in the same habitat; best told by voice, and, if seen well, by clear pale underparts that lack olive mottling.