You can fiddle with the wire and the "pan" notch
to make the regular rat traps more sensitive
I've used em for squirrels, but I found 110's do
a better job and a squirrel can't wiggle it's way
out of a 110. Even if you catch it too far back,
it'll still be in the trap waiting for you and your
dispatch stick.
I'd advise securing whatever trap you use to
keep other critters from taking your trap and
prey off somewhere
