The Carcharhinus Leucas

The Bull shark is a freshwater shark that lives in the Amazon river, it has a blue/grey back and a white underside for camouflage. It has a very aerodynamic body and moves through lateral undulations of its body while using its many fins for control in the water. It hunts by chasing and clamping its jaws around unsuspecting fish. In the future, much of the amazon's water will dry out, leaving the shark's two sided camouflage much less useful. Instead, the shark will turn to ambush predation, capitalizing on the fact that the shallower water will leave fish closer to the riverbed. It will do this by changing its camouflage to a sandy color, merging its fins and becoming flatter, all to be able to lie on the sandy bottom unnoticed. It will then grab fish from below to hunt.