The Black-backed Water-tyrant is a species of bird in the Tyrannidae family, the tyrant flycatchers. It is one of three species in the genus Fluvicola. It is found in South America in central and northeastern Brazil and south through Bolivia, Paraguay, northern Argentina and Uruguay; also eastern Peru. Its natural habitat is swamps. This tyrant is a striking bright-white and black bird. Range: Amazon Basin, Caatinga, Cerrado, to Argentina The Black-backed Water-tyrant is a resident breeder in the southeast Amazon Basin, a range that continues east through the Caatinga to the Brazil coast, and only inland, south through the Cerrado to eastern Bolivia, central and western Paraguay, and northern Argentina, and ending at the South Atlantic coast, ranging into only southern Uruguay. The northern range-limit in the Amazon Basin is the Amazon River strip; in the southwestern Amazon Basin, into Amazonian eastern Peru and northern Bolivia, the Black-backed Water-tyrant is a migrating non-breeder. In Peru, the north-flowing Ucayali River is its western limit, and at the Amazon River's outlet in the northeast, the bird ranges into southern portions of Brazil's Amapa state.

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