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This Piranha is often found in whitewater rivers and is found in groups. Due to the atmosphere in the Amazon drying up , this will cause rivers to dry up. These piranhas adapt by no longer shoaling and instead opting for camouflage to protect from prey. They have also developed a lung (one like the lungfish) to make up for lack of oxygen in the rivers. They are also smaller so more can fit into the shallow rivers.