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Bull sharks are threatened by water pollution, overfishing, oil spills, and global warming. Bull sharks are able to move into saltwater and freshwater and they can move into shallow water which explains why they have the most shark attacks in the world. Bull sharks every year migrate up rivers and around the world, but because of global warming it’s messing up their migration patterns and they are migrating to places they’ve never seen before. Overfishing is a problem because sharks keep the ecosystem in balance and since we are overfishing them, they don’t have enough time to repopulate. Bull sharks like many marine animals need saltwater to survive, but because of the oil spills they inhale it through their gills and suffocate or the fish they eat is contaminated with it the shark is poisoned, or they accidentally eat a piece of plastic and die. Bull Sharks are facing extinction.