The common tody-flycatcher (Todirostrum cinereum) is a small passerine bird in the family Tyrannidae, the tyrant flycatchers. It is found in Mexico, in every Central American country, and in every mainland South American country except Chile and Uruguay.
The common tody-flycatcher is a tiny, big-headed bird, 8.8 to 10.2 cm (3.5 to 4.0 in) long, weighing 4 to 8 g (0.14 to 0.28 oz), and with a long, flattened, straight bill. Adult males of the nominate subspecies T. c. cinereum have a glossy black forecrown and a slate-gray hindcrown and nape. Their lores and the area around their eyes are glossy black. Their upper back is slate-gray that becomes dark olive all the way to the uppertail coverts. Their wings are black with yellow edges on the flight feathers and yellow edges and tips on the coverts; the last show as two wing bars. Their tail is black with white tips on the outer feathers. Their entire underparts are bright yellow. They have an all-black maxilla and a black mandible with a pinkish white base. Adult females have a grayer head than males and an entirely pinkish white mandible. Both sexes have a yellowish to white iris and bluish gray legs and feet. Juveniles have dark gray crown and cheeks, a buffy tinge to the wings' yellow parts, a dark iris, and paler yellow underparts than adults.
