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A flock of herons take flight over the black-water's of a fetid canal that connects Lagao da Tijuca with Lagoa da Jacarepagua in Barra da Tijuca, the district housing much of the 2016 Olympic's infrastructure. <br />
Two decades of development has destroyed much of the area's natural habitat area and newly built luxury condominiums release raw sewage into the once-pristine lagoons and their connecting canals.