Ditto that. 'Way back when (early 1990s?), I visited a friend in TX. His roomie and I got to messing around with wrist rockets and cheap small marbles and when soda pop cans in the bushes became too easy a target, we started aiming at rats and squirrels that would run on the telephone lines. We got our share and I bet the neighbor never did figure out why all those marbles were in his pool :-)
You can see how, with practice, it could indeed become a survival tool. I would hate to have to learn how to do it under the stress of having to get food to survive.
No pressure...:)