Bull sharks are renowned for their unusual migratory pattern in tropical and subtropical waters.
Their ability to go in and out of seawater and fresh water is unique for marine sharks.
Their tolerance of the missing salt levels and adjusted metabolism is the main reason they are found living close to rivers (and upstream) all around the world.
Carcharhinus leucas is a minority species of sexually mature sharks which are capable of surviving in sweet water.
Therefore the distribution and habitat range of the bull shark includes well known river waterways and lakes including the Amazon, the Mississippi, and the Zambezi.
Whole populations of this amazing creature have been documented as living far inland as 3,500 kilometers in sweet water areas like Nicaragua and Guatemala. They are also commonly found in brackish water systems like the Indian River System in Florida.
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