A tiny, bright green parrot found throughout much of the Amazon basin. Dusky-billed has darker green plumage and a dark upper bill compared to the very similar Blue-winged Parrotlet. Dusky-billed is also less likely to be found around clearings than Blue-winged. Often first noticed by the incessant high-pitched, buzzy calls given by flocks, not as high-pitched and piercing as the calls of Blue-winged.