Aggressive Bull Sharks

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One of nature’s deadliest predators, the bull shark, can spend a lot of time in fresh water. They’ve been spotted swimming thousands of miles up the Amazon River and jumping river rapids in Nicaragua. The secret to this adaptation is their ability to retain salt inside their bodies – the bull shark’s kidneys and special gland near their tails help recycle salt.

Like a true bull, these sharks are large, muscular, wide-bodied and barrel-chested. Their short, wide head translates to a powerful bite. A bull shark’s triangular lower teeth restrain prey while the upper jaw moves up and down, delivering full bite force. And as the teeth sink into a victim, deadly bacteria transfers from the teeth into the prey.

Bull sharks max out at around 11 feet in length and five hundred pounds. They prefer to patrol shallow, coastal waters. These aggressive, agile sharks utilize sudden bursts of speed to attack a wide range of prey, from small, bony fish to other sharks to dolphins. Even humans. But in the United States, there are only about sixteen shark attacks annually – you’re more likely to be struck by lightning – so ocean-loving individuals should shed their worry.

Follow Brady Barr as he studies three aggressive shark species – the great white, bull and tiger. Watch Dangerous Encounters: Deadliest Sharks TONIGHT at 9P et/pt on Nat Geo Wild!

Video Preview: “Return of the Shark” — Brady is out to discover which powerful shark has the most deadly bite in the ocean.