The Common Tody Flycatcher (Todirostrum cinereum) is a tiny yellow and black bird - as small as a "large hummingbird" according to my notes. This one is heard piping and trilling at La Fortuna, near Volca Arenal (Costa Rica).
Here is the characteristic call of a Common Tody Flycatcher (Todirostrum cinereum), from the Arenal area (Costa Rica) (Black-striped Sparrow in the background).
