Blue-winged Parrotlet

The Blue-winged Parrotlet (Forpus xanthopterygius) is a small parrot found in much of South America. It includes the Turquoise-rumped Parrotlet (Forpus xanthopterygius spengeli), which sometimes is treated as a separate species. The Blue-winged Parrotlet is mainly found in lowlands, but locally up to 1200m in south-eastern Brazil. It occurs in woodland, scrub, savanna, and pastures. Flocks are usually around 20 birds but can grow to over 50 around fruiting trees or seeding grasses.

http://en.wikipedia.org/wiki/Blue-winged_Parrotlet