Where is the basis for this "echo-location" claim? I don't think that's right.

If you turn the volume all the way up when you are in a falmer cave you can actually here a "pinging" sound when you are within sight of a falmer and it's "looking" at you.

Why, only yesterday a spelunker appeared on local TV with a story about an unpremediated bat attack. Seems the bat attacked with a bow and arrow. Arrows whizzed past his ears, he told the reporter, as he scrambled to get out of the cave. He almost lost his life, he claimed. The experience, he says, has turned him into a bow-control advocate. Something needs to be done about these roving gangs of bats armed with bows and arrows, he told the reporters. Before we know it they'll be coming out of those caves and endangering the lives of innocent citizens.

True story.

I thought it was more like a faint:

"Trolololololololol"

-HK

Echo-location.

^This
The other possible theory is they have such good hearing that they can hear heartbeats.

Or maybe they can sense changes in the ambient electrical field, like fish...

They might be like Eco the Dolphin. Only their game isn't as insanely hard.

Gah!
Years of therapy undone!!