Redfrog I have the above call it works like a charm, especially usefull at rimfire sorts of ranges. The science (from a U of Lethbridge site) is that gopher (richardson ground squirels) have two basic warning calls one for aerial predators (shorter and variable pitch) and one for ground predators (longer single pitch). Thier reaction is different for the two calls the short one they take cover (aerial attacks are fast) with the long call there tendency is to stand up and look for the threat. Which exposes them to be shot.
Typical routine with me is to :
find an area that has them
sit down
shoot the ones dumb enough to not hide
shoot the ones dumb enough to come out to see what all the shooting is about
start caling
shoot the ones dumb enough to come out to see where the trouble is.
Move to the next likly spot and repeat.
The furthest I have had them stand up is 200ish, weather they stood because of the call at that range it is hard to prove, but under 100 it is really obvious that it works.
It is so worth the 20$ don't leave home without it /ubbthreads/images/graemlins/smile.gif