The common tody-flycatcher or black-fronted tody-flycatcher (Todirostrum cinereum) is a very small passerine bird in the tyrant flycatcher family. It breeds from southern Mexico to northwestern Peru, eastern Bolivia and southern Brazil.
The common tody-flycatcher is a tiny, big-headed bird, 9.5–10.2 cm (3.7–4.0 in) long, weighing 6.5–6.8 g (0.23–0.24 oz), and with a long, flattened, straight black bill. The upper head is black, shading to dark grey on the nape and dark olive-green on the rest of the upperparts. The usually cocked tail is black with white tips, and the wings are blackish with two yellow wing bars and yellow edging to the feathers. The underparts are entirely yellow. Sexes are similar, but young birds have a greyer upper head, buff wing markings, and paler underparts. source