Just make the ranch by dusk, and the conversation soon turns to attacks de la soul Culebra.

A laborer tells me that the attack Carmelo heard about happened only six months ago.

This time it wasn't on a human, but something larger and much more powerful.

Three cowboys found a horse from a neighboring ranch that had swam across the river onto their land.

They got it back into the water to return it.

It was literally just a few feet away from the bank on the Peronnas attacked it Ondas.

Soon as it started, bleeding more, more for honest kind cowboys desperately trying to recover the holes.

Just the time that it took them to do that, the animal was dead.

Not only that, it had being hollowed out by the fish on.

When they managed to get the body of the horse out of the water, there was apparently just a stream of Peronnas falling out of a hole in its skin.

It was that quick that it happened.

The's latest stories have given me a lot of food for thought.

I realize I can't deny the mounting evidence I'm faced with any longer.

Peronnas here are attacking healthy living people on even creatures is largest horses.

But why?

Perhaps something has happened in the river to provoke this change in behavior.

I've seen something similar before.

In Pop, your New Guinea normally vegetarian packers started attacking humans in the absence of his usual food supply.

If the peaceful pacu can be transformed into a savage attacker, could something similar happen when the Peronnas environment has changed?

I start asking around to see if people have noticed anything that's changed in the Rio Yata.

I'm soon told of a predatory fish that appeared in these waters just 20 years ago.

Could its arrival have some connection to Red Berry Peronnas turning into a man Killers hours passed and nothing is biting.

We decide to fish into the night.

But one of my guides, Gary, is concerned that the weather is only going to get worse.

Okay, so we bring his fishing method into play, too, to increase our chances of catching this mysterious fish.

There's one million line.

Every 10 years or so, debates are gonna be suspended.

The bottom will be somewhere in there water.

So it's fairly intensive deployment hopes and rights fishing at night means I'm working virtually blind.

But if the creature I'm here's a find has truly invaded these waters can Hopefully I'll be able to get a base in front of one.

Yeah, that's a fair.

Shows a fish.

Gary tells me this is the mystery fish he brought me here to find.

I just love this annex.

One met before.

So that guy, this is another appointment.

This is a fish I was never expecting to catch here.

Our appointment's shouldn't be in Bolivia.

They're not native to these waters.

But their presence here could explain the glory attacks that happened on the Rio Yata.

Deployment of formidable predators on one fish is a favorite meal, Peronnas.

If these waters are riddled with our climate, they could be nailing the Peronnas, picking off the slower, weaker ones and leaving the stronger and more aggressive fish.

And if they're competing for the same food as well, perhaps this has forced the Peronnas to become much more aggressive.

This is a young air, a primer, and to me that makes it even mawr significant.

It means the Arab heimer haven't just invaded, but they're breeding here.

How many more are out there How bad has this invasion become?

Way Need to check the lines.

As we pull them in.

It becomes clear.

Way is a fish.

They're here in force.

Please.

Fish, given the right conditions, warm or so they don't need a lot of oxygen.

They can absolutely takeover.

So once the genie is out of the bottle, you know there's no putting it back.

These things here to stay, and I know only too well how big they grow.

Consider fish dominating the waters they live in massive female our apartment.

In the case of what happens on the really out of that day are seen now possible pieces of the jigsaw.

Maybe this is what caused Oscar's death.

Know the direct cause.

One of the factors that upset the balance.

I'm pushed the Peronnas into becoming more aggressive, attacking anything and anyone as they fight for survival in this more competitive and dangerous river world.

Maybe it was only a matter of time before someone was killed.