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Bull Sharks Upriver | National Geographic

00:00:08the attacks come with terrifying

00:00:11regularity here in the world’s largest

00:00:22mangrove swamp in the Bay of Bengal

00:00:25villagers trudged through a murky river

00:00:28to net shrimp larvae locals speak of a

00:00:33monster that attacks underwater without

00:00:36warning it happened to sumitra mystery

00:00:45barcelona Cabo sorry it was an ordinary

00:00:49day I woke up and then I went for

00:00:52fishing in the river I was pulling my

00:00:58net in the water for three hours when

00:01:00the animal bit me it was like a sharp

00:01:04razor cut

00:01:05I pushed the animal and it immediately

00:01:08took off my hand

00:01:11I swam to the shore and saw the blood

00:01:13running from my hand

00:01:19many here bear the scars of these

00:01:21frightening encounters National

00:01:30Geographic biologist rocky strong an

00:01:32adventurer Fabien Cousteau have come to

00:01:35investigate rocky believes the culprit

00:01:41might be a bull shark

00:01:49they set the bait

00:01:52why this spot versus any other this is a

00:01:55place where two major rivers converge

00:01:59and even more importantly all the locals

00:02:03say this is a good spot for sharks

00:02:20something is biting

00:02:23but the researchers can’t make a catch

00:02:40well no no really even good good bites I

00:02:45have to say it’s the longest time I’ve

00:02:47spent fishing without any results at all

00:02:53later they’re led to a market were two

00:02:56small sharks are for sale so in here all


00:03:04goodness gracious ah this is this is a

00:03:08brand new pup by the look of the

00:03:12umbilical marks these pups were newborns

00:03:14to determine the species the researchers

00:03:20count T five six seven eight nine and


00:03:28that’s our fish it’s conclusive these

00:03:32are bull sharks as rocky suspected this

00:03:36sometimes aggressive species has been

00:03:38documented in rivers throughout the


00:03:43Rocky’s theory is that bull sharks

00:03:45developed the ability to live

00:03:47temporarily in freshwater so that

00:03:49females can give birth where their young

00:03:51are safest from other sharks but maybe

00:03:56it’s after giving birth that the females

00:03:58had further upriver in search of food

00:04:00sometimes encountering people why Upper

00:04:05River versus say further down the coast

00:04:07or deeper into the ocean because they

00:04:11can because they can leave all their

00:04:13competitors behind and be king of the

00:04:16hill up inside a an environment that

00:04:20they’re very good at dealing with and

00:04:22other sharks just aren’t

00:04:31both shark and human are seeking food in

00:04:33these waters to help them survive

00:04:39and that competition can sometimes lead

00:04:42to dangerous clashes