The attacks come with terrifying regularity. Here in the world’s largest mangrove swamp in the Bay of Bengal, villagers trudge through a murky river to net shrimp larvae. Locals speak of a monster that attacks underwater without warning. It happened to Samitra Mistry. It was an ordinary day.
Best 08, bullsharks

I woke up and then I went for fishing in the river. I was pulling my net in the water for three hours when the animal bit me. It was like a sharp razor cut. I pushed the animal and it immediately took off my hand. I swam to the shore and saw the blood running from my hand. Many here bare the scars of these frightening encounters.

National Geographic biologist Rocky Strong and adventurer Fabian Couso have come to investigate. Rocky believes the culprit might be a bull shark.
Lets go.

They set the bait.
Why this spot versus any other. This is the place where two major rivers converge and even more importantly all the locals say this is a good spot for sharks.
Something is biting. But the researchers cant make a catch.
Well no really even good bites. Have to say it’s the longest time I have spent fishing without any results at all.
So then here?
All yours. Unwrap it.
Goodness gracious. This is a brand new pup.

By the look of umbilical marks, these pups were new born.

Male and Female.

To determine the species the researchers count the teeth.
That’s our fish for sure.

Its conclusive, these are bull sharks as Rocky suspected. This sometimes aggressive species has been documented in rivers throughout the world. Rocky’s theory is that bull sharks develop the ability to live temporarily in fresh water. So that females can give birth where their young are safest from other sharks. But maybe its after giving birth that the females head further up river in search of food sometimes encountering people.

Why up a river versus say further down the coast or deeper into the ocean.
Because they can. Because they can leave all the competitors behind and be king of the hill up inside an environment that they are very good at dealing with and other sharks just aren’t.

Bull shark and humans are seeking food in these waters to help them survive. And that competition can sometimes lead to dangerous clashes.