Go further with Dana's suggestion -- move some cat litter box remains up to the attic (temporarily!) That might tell them there's a predator nearby... We got fewer chipmunks pooping on our porch after the dog pissed on the bushes nearby.
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per·son \ˈpər-sən\ (noun) - an ephemeral collection of small, irrational decisions
The fun thing about evolution (and science in general) is that it happens whether you believe in it or not.
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