> As far as sticky board evidence, 
> it would be helpful to be able to
> distinguish mouse feces from shrew.

I have been a beekeeper long enough to distinguish many types of feces at a
glance, all the way from "chicken-" up to the more common "bull-".

Shrew droppings will be curved, even corkscrew.
Mice droppings are never curved or twisted - they look like tiny versions of
caplet-style pills.
Rat droppings are MUCH bigger than either mice or shrew, as you'd expect.
Hard to tell squirrel from rat droppings most times.

By the time I became a Cub Scout, there was no longer a merit badge for it,
but we all still strove to master the art of tracking, concurrent with
reading James Fenimore Cooper books. I would wander Rock Creek Park in
Washington DC, which was quite a bike ride from Georgetown for a 7-year-old,
tracking mostly squirrels, hoping to find bobcat tracks. The best reference
materials we had were photostats of the original Boy Scout merit badge
pamphlet, which was titled "Stalking".   This was also the name of the merit
badge in those much more innocent days.  

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