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Populations of Nearctic–Neotropical migratory songbirds that overwinter in South America are declining at greater rates than those wintering elsewhere (NABCI 2012). Persistent population declines over the last 50 years in species that overwinter primarily in montane habitats in the Northern Andes of South America are associated with habitat loss and deterioration on the wintering grounds (Jones et al. 2004, González-Prieto et al. 2017, Kramer et al. 2018, Wilson et al. 2018). For instance, species of conservation concern such as the Cerulean Warbler (Setophaga cerulea), Canada Warbler (Cardellina canadensis), and Olivesided Flycatcher (Contopus cooperi) have a predominantly Andean wintering distribution and have experienced steep declines in their populations in recent decades (Sauer et al. 2017) (Fig. 1).

Conservation of Nearctic Neotropical migrants: the coffee connection revisited