Bull sharks, with a large torso, are named for their sturdy, cow-like shape, broad flat nose, and aggressive habits. The total length is 2.1-3.5 meters.
The bull shark has an ability that many sharks don't have: it's the only shark that lives in both saltwater and freshwater environments. Over the course of their long evolution, they developed a mechanism for adapting to fresh water, maintaining the balance of salinity in the body by regulating the amount of salt in the blood with other substances.
Bull sharks have been found in rivers close to the sea, such as the Ganges River in India, the Gulf of Mexico in the Americas, the Zambezi River in Africa, and the Mississippi River in the United States.
After entering the river, the bull shark will become fierce and rough due to changes in hormones and other secretions, which is more dangerous. Whether it's Lake Nicaragua in the central Americas or Port St. Louis on the Mississippi River, bull shark injuries have occurred. (Pictured: Scars left after being attacked by a bull shark)
Bull sharks have poor eyesight, but their sense of smell is unusually sensitive, their eating habits are very mixed, they are known for not being picky eaters, and in their stomachs, they have found the carcasses of cows, dogs, people and even hippos, and sometimes, bull sharks even eat other sharks.
Small bull sharks are preyed upon by crocodiles in freshwater watersheds.
Saltwater crocodiles prey on bull sharks at the mouth of rivers.
Bull sharks are listed along with great white sharks and sand tiger sharks as the most aggressive, ferocious and most commonly attacking humans.