Common Tody-Flycatcher
Todirostrum cinereum
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.
ID text from Wikipedia, CC BY-SA 4.0

Spotted Tody-Flycatcher
Todirostrum maculatum
The spotted tody-flycatcher is 8.9 to 10.2 cm (3.5 to 4.0 in) long and weighs 6.4 to 8.3 g (0.23 to 0.29 oz). The sexes have the same plumage. Adults of the nominate subspecies T. m. maculatum have a mostly gray head with a small white spot above the lores and some black and white streaks on the crown. Their back, rump, and uppertail coverts are olive. Their wings are brownish black with yellow edges on the flight feathers and yellowish edges and tips on the coverts; the last sometimes show as pale wing bars.
ID text from Wikipedia, CC BY-SA 4.0

Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Common Tody-Flycatcher and Spotted Tody-Flycatcher.