[Cypseloides niger] (MGT):breeds in North America and migrates south, sometimes in large flocks, and groups of 300 to 400 individuals have already been recorded in California (Chantler, 1999). Geolocation data showed that the fall migration of C. n. borealis started between September 10 th and 19 th, that it reached the wintering grounds in Western Amazonia (especially in AM) between September 28 th and October 12 th, and that it departed from these grounds heading to the breeding sites between May and June (Beason et al., 2012). This is the first piece of evidence of wintering grounds for this species in Brazil, which is why it is considered migratory.