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Pirarucu is a huge fish (3 meters long and 200 kgs) that comes from the Cretacic era. It lives in the Amazon river. Females produce a white substance to feed their young. It has a bone studded teeth tongue that crushes its prey. It adapted to live in murky and oxygen-poor waters, so its eyes are too sensible to sun rays and it needs to breathe air, but the periods must be less than 1 and 1/2 hours to survive. To adapt to climate change, the future pirarucu will evolve to have separate respiratory systems to survive both environments inside the water and outside it for long periods as the droughts and floods will be more intense and longer. Also, it would allow him to escape from predators or hide from fishermen as in danger today for overfishing. Its fins will be stronger to move also on land.