Studies, Wildlife conservation, Insects, ENSO, Bird migration, Costa Rica, condition index, El Niño—Southern Oscillation, spring migration
Birds, recruitment, Migration, elevation, Species, Mountains, Small mammals, Song, Breeding, Abundance, Adults, Migrants, Pacific Northwest, Movements, passerines, mist net, molt migration, altitudinal movements, Songbirds, Molting, Feathers, Migratory species, Breeding grounds