This is when the forest really comes to life.

This is one animal start coming out and five miles north of base Camp Maria is closing in on an area where, along with team member RPG, she discovered high levels of animal traffic and predatory activity.

But tonight she returns alone.

Most animals are less likely to attack if they're outnumbered going in alone, there's more of a risk.

And so because there are a lot of things that could go wrong, you have to be really aware of all your surroundings at all times.

I'm gonna head over that way and put out some calls on see what happens.

Maria believes this is tthe e ideal location to attempt a Bigfoot call.

Some of the methods that Bigfoot researchers employee out here are actually not that different from my own research.

I've often made gorilla calls, and I've gotten a response back.

So based on eight behavior, it's actually a really successful method.

So Bryce loaded up a big foot recording on this.

Making calls is a huge part of Bigfoot research.

In fact, some of the best evidence that we have for the existence of Bigfoot comes from vocalizations recorded in the field.

Most people, when they do it themselves right there pretending to be a Bigfoot tonight is gonna be different.

We're gonna be playing back, Ah, high quality Bigfoot sound that was recorded just last year.

And I am extremely hopeful that when we play this back over the Fox Pro, we're gonna be able to elicit a response.

The speaker system Maria is using has a top output of 118 decibels or the same sound level as a jackhammer, meaning anything within a two mile radius will be able to hear it.

This is reportedly the best time of night to go hunting for Bigfoot by me playing this supposed Bigfoot sound out there.

That should elicit a response back because I'm an intruder in its territory and the territorial species will want to let you know that you're on their turf so it could attack, which could be super dangerous.

What?

I'm gonna go ahead and try all right here?

Yeah, you're facing an animal that you know nothing about.

There's no manual telling you that what you should do is stand still and hold your ground or climb a tree or run as fast as he can in the other direction.

It's an unknown, but we get a response.

I'm going in after it.

That's what I would d'oh in the field in Africa.

And that's what I'm gonna do here tonight.

We didn't get any response on that one.

So we're going to try it again.

Sometimes.

Just because we're not hearing anything doesn't mean there isn't something out here.

You hear that?

Oh, my God.

After playing a Bigfoot howl into the forest, primatologist Dr Maria Mayor has just heard something returned the call.

I have no idea what that Waas, but it sounded like snippets of the Bigfoot recording I just played.

You know, I can't really tell for sure where that sound is coming from.

It could really be from any direction cause it's bouncing back.

Not sure sounded like it was coming from that direction.

Maria decides to head northwest where she believes the sound originated from, and where the animal that made it may still be so hard to see anything.

You really only see the next tree up.

Nothing past it.

This creature that we're searching for is allegedly over seven feet tall and could be £1200.

I've gone on many nocturnal hunts looking for primates.

It's very different when you're out there and you're searching for something big, and you have no idea what it's behavior is like.

I literally can't see anything your insurance com and have deep until forced.