BullShark (Carcharhinus Leucas), one if not the only shark species that can live in fresh and saltwater. In the top 3 of most dangerous sharks because of its high testosterone (many times that of an elephant in the musth) which makes it aggressive and also its tendency to inhabit warmer coastal waters and even rivers, making contact with humans more likely. Sadly enough overfishing with nets mostly is wiping out this shark species too, and while it will attack a few times worldwide per year at most, we kill 60 million sharks on average each year, take a good look because this shark is becoming rare. And ofcourse the netting will not be done at the coast mostly, still we should preserve:)