When it’s predictable and wildlife is well adapted, natural flooding can create a biological bonanza. In the Amazon River Basin, which holds one-fifth of the world’s fresh water, annual rains can raise water levels 30 to 40 feet in just days. Forests turn into vast lakes, dotted with trees, while a massive push of sediment erects new islands almost overnight. It’s a lush world that’s home to some of the world’s most iconic birds, including toucans, macaws, kingfishers, tiger-herons, and this Russet-backed Oropendola.

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