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Keywords:Argentina, Brazil, Courtship Flight, Cypseloides senex, Great Dusky Swift, Great Dusky Swifts (Cypseloides senex), Iguazu Falls, Iguazu Falls National Park, Iguaçu, Lindblad Expeditions, National Geographic, Sub-tropical Atlantic Rainforest, UNESCO World Heritage Site, bird watching, ecotourism, rain forest, tourism
