Just west of Chichiriviche, the Cuare Wildlife Refuge protects a network of mangrove lagoons that hold flamingos, scarlet ibis, herons, pelicans, and over 300 other bird species. The flamingos are the headline attraction — pink against grey mud at low tide, often visible from the road.
Most boat operators in Chichiriviche will combine a cay trip with a swing through Cuare; ask for the "ruta de los manglares". A few specialist guides offer dawn or dusk bird-watching trips, which are far more rewarding than a quick daytime drive-past.