Primeval, Series 1

[After the group narrowly survive an attack from the future predator]

Nick:
It was one step ahead of us all the time. It knew what we were going to do before we did it!

Helen:
I warned you it was smart!

Nick:
It would be more useful if you could tell us how to catch this thing.

Stephen:
What we need is some kind of edge, a weakness in its defences that gives us an advantage, otherwise it's just gonna pick us off one-by-one!

Connor:
Dogs. The dogs went crazy before it attacked. What would make them go off like that?

Stephen:
Can't be smell. If there was a scent trail, they would have followed it.

Nick:
Hearing. They heard something.

Connor:
Sound. It's using sound.

Nick:
That's why it was able to remain one step ahead of us! It can detect physical movement before it's within visual range!

Connor:
And the dogs, they detect a higher frequency, therefore they know when it's nearby!

Ryan:
Like echolocation?

Nick:
High frequency sound waves, it's like a sonar system. Some animals use it to detect prey.

Stephen:
Like a bat. Well, you said there was bat blood in the lion enclosure.

Connor:
That's it. This thing must be some kind of...I dunno, super-bat.

Helen:
He's right. Three quarters of all mammal species are bats or rats; maybe the future belongs to them.