Dan is very fast. We couldn't have done this study without him.

For me, it all comes down to the determination of the critter. It's a matter of environment.

I've seen a grizzly bear go out of its way to avoid a wolverine.

What mountaineers would consider climbing routes, they use all the time.

I think it's important. Scientifically, it's a mystery. That's as good as it gets.