Scrub Euphonia
Euphonia affinis
The scrub euphonia is about 10 cm (3.9 in) long. It weighs 8.5 to 12.8 g (0.30 to 0.45 oz). It has a short stubby bill. The species is sexually dimorphic. Adult males of the nominate subspecies have a small yellow forecrown; the color extends just to the eye. The rest of their head and nape are glossy blue-black with a purplish sheen. Their upperparts are glossy blue-black. Their tail is mostly blackish with white inner webs on the outer two pairs of feathers. Their upperwing coverts and flight feathers are blackish with some dark blue gloss. Voice: The scrub euphonia's calls include "1–3 pure thin whistles, dee-dee-dee, sometimes followed by 2 or 3 more on same or slightly lower pitch", a "shorter whit-it-it-it", and a "longer wheeee". It sings less than it calls, with "a weak twittering and chirping medley, e.g. wheetidy-titity-witity-titity". Its song and that of the West Mexican euphonia are similar but this species' is slower.
ID text from Wikipedia, CC BY-SA 4.0

Violaceous Euphonia
Euphonia violacea
Adult violaceous euphonias are 11.4 cm long and weigh 14 g. The male has glossy blue-black upperparts and a deep golden yellow forehead and underparts. The female and immature are olive green above and greenish yellow below.
ID text from Wikipedia, CC BY-SA 4.0
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Scrub Euphonia and Violaceous Euphonia.