Bob

Is there an actual rattle or is it just shaking it's tail that way? Maybe your local animal control officer would help. If you don't mind turning off or down the heat in most of the house it may be attracted to a warm spot where you could catch it..... throwing a towel over and grabbing it it works well if you're not too squeemish aout that sort of thing. Pinning it down with a golf club or something similar would work too.

Good luck.

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