Black-headed Tody-Flycatcher
Todirostrum nigriceps
The black-headed tody flycatcher is a small bird with a glossy black head and a white throat. The black coloring continues down the sides of the neck. It has bright yellow underparts and olive-yellow upperparts. The wings are black with two yellow wingbars and yellow streaking and the tail is short and black. Its head is relatively large, as is its straight black bill. It has dark irises and no eye-rings. Its legs are blueish-gray. The females and males have the same coloring. Adults are between 8–10.2 cm long and weigh 6–6.5 g. Voice: This species' call is a single high-pitched "peep". Its song is a series of 5 to 8 high-pitched "jyip" notes that are quickly repeated. They start evenly spaced and accelerate slightly at the end, increasing in pitch slightly. It often calls repeatedly, which can be easily confused with their song. The chirps also sound insect-like. Listen to the call Listen to the song
ID text from Wikipedia, CC BY-SA 4.0

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

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: Black-headed Tody-Flycatcher and Common Tody-Flycatcher.