Over on the book thread, samwik mentioned sending some info to trilo. While you're at it, send him the following link:
http://www.slate.com/id/2154696

It could be a hoax, but it's interesting.

It's a common hoax from china, e.g., that there are kids who can read with their bottoms. No kidding. And there's a girl in russia , I think, who is claimed to be able to diagnose illness. I saw 2 specials on this girl - one that really never tested her that made it very clear she was authentic. The other actually did do a test (by Dr. Ray Hyman) and she failed -- just barely, but she failed. Anyway, while the sonar kid seems unlikely in the extreme, it's not entirely implausible, I think.

If true, the implication is that one doesn't need a complex system specifically for "echolocation" in place before one can practice some rudimentary echolocation - which is pretty much what every evolutionist would already know.