Bicolored Conebill
Conirostrum bicolor
The bicolored conebill is 11.4 cm long and weighs 11 g. The adult is grey-blue above and buff-tinged grey below, with red eyes, pink legs and a sharp, pointed bill. The primary flight feathers are bluish with brown edgings. The sexes are similar, although the female may be a little duller, but immature birds are greenish above and have pale yellow underparts. Birds sometimes breed in immature plumage. It is similar to the pearly-breasted conebill, alongside which it occurs in the Amazon.
ID text from Wikipedia, CC BY-SA 4.0
Blue-backed Conebill
Conirostrum sitticolor
The blue-backed conebill is a small bird, weighing 11-13g. While subspecies differ slightly in appearance, all subspecies have some amount of black on their head, a blue back, rump, and tail, and an orange underside. The nominate subspecies, C. s. sitticolor has a fully black head and throat, and black wings, while C. s. cyaneum has a black cheek, chin, lore, and crown with a blue post-ocular stripe and throat, and blue wings. As the name would indicate, C. s.
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: Bicolored Conebill and Blue-backed Conebill.