Bull Sharks Carcharhinus leucas are best known for their aggressive behavior, and their ability to survive in fresh water. They are believed to be the most dangerous shark in the world to humans, because of their high abundance in shallow, warm waters of all the world’s oceans.
These animals get their name from the short, blunt snout, as well as their pugnacious disposition and a tendency to head-butt their prey before attacking
These sharks are unlike any other in that they will venture into brackish and even fresh water for food and to give birth. Bull sharks have actually been found thousands of miles up the Amazon River, and in Nicaragua have been seen leaping up river rapids, salmon-like, to reach inland Lake Nicaragua.
Bull sharks currently are not threatened or endangered. However, they are fished widely for their meat, hides, and oils, and their numbers are likely shrinking. One study has found that their average lengths have declined significantly over the past few decades.