This newfound reptile appears to be the first known freshwater mosasaur, an animal comparable to modern river dolphins now seen in the Amazon, Ganges and Yangtze rivers.

MSN: Huge 'sea monster' ruled ancient rivers

River dolphins of that colour can be spotted in the Amazon River.

BBC: Into Peru��s Amazonian heart of darkness

Peru-based Aqua Expeditions launches the MV Aria this month, a 150-foot boat that will sail up the northern Amazon to view remote locations and rare wildlife like the native pink dolphins.

BBC: Openings