Vireonidae, Swainson, 1837

Somenzari, Marina, Amaral, Priscilla Prudente do, Cueto, Víctor R., Guaraldo, André de Camargo, Jahn, Alex E., Lima, Diego Mendes, Lima, Pedro Cerqueira, Lugarini, Camile, Machado, Caio Graco, Martinez, Jaime, Nascimento, João Luiz Xavier do, Pacheco, José Fernando, Paludo, Danielle, Prestes, Nêmora Pauletti, Serafini, Patrícia Pereira, Silveira, Luís Fábio, Sousa, Antônio Emanuel Barreto Alves de, Sousa, Nathália Alves de, Souza, Manuella Andrade de, Telino-Júnior, Wallace Rodrigues & Whitney, Bret Myers, 2018, An overview of migratory birds in Brazil, Papéis Avulsos de Zoologia 58, pp. 1-66 : 19

Vireonidae

Vireo olivaceus (MGT) : breeds in North America, from where it flies to join Vireo chivi in Brazil during boreal winter ( Sick, 1983). Geolocation data suggests that ten individuals from one breeding population that had been captured in northwestern Pennsylvania, USA, wintered in northwestern South America. Most of them used only one wintering site, but two individuals used one wintering site from late October to early December before reaching their final wintering site, where they remained for four months. During spring migration, individuals migrated through Central America through the Yucatán Peninsula and crossed the Gulf of Mexico, landing near the delta of the Mississippi River in Louisiana. Fall flyways could not be properly mapped. The dates in which individuals reached the wintering area varied from October 14 th to November 4 th, and the departure dates from South America in spring in late March were correlated with the arrival dates to the wintering site ( Callo et al., 2013). The lack of specimens in the Brazilian Amazon when compared to eastern Peru suggests that most of the population overwinters in the foothills of the Andes and only a small number does so to the east in the Amazon ( Stotz et al., 1992). However, this species is present in the Amazonian region in Brazil from September to March ( Almeida, 2011a, b; Stotz et al., 1992), as suggest- ed by photographic and museum records for RR, AM, RO, PA and MT between August and April (WikiAves, 2016; MZUSP; MPEG). Also, there are two specimens collected in AM in July (MZUSP).

Vireo altiloquus (MGT) : breeds in Florida, Bahamas, Cuba and Cayman Islands and migrates to the Amazon Basin ( Sick, 1997; Brewer & Orenstein, 2010). Records in Brazil are mainly to the north of the Basin and are from September to February ( Stotz et al., 1992). Only small numbers occur south of the Amazon River, and the southermost record is for Sinop/MT in March (WikiAves, 2016). Photographic records and collected specimens for AM and PA are from September to March (WikiAves, 2016; MPEG), which confirms the pattern suggested in the literature.