la sagra's flycatcher Myiarchus sagrae

An inconspicuous woodland species often first detected by voice. Note its slender build, dull coloration, and tendency to lean forward (often at 45°) when perched. The similar Great Crested Flycatcher has darker gray chest, brighter yellow belly, heftier bill and rustier tail. Vocalizations include a quick “sweet” and whistled “whit-it, did-id-oo.”