i had the same problem with my ferrets.  what i finally did was get a cat
litter box that took up the whole side of their cage.  their food is on the
other side, so they won't sue those corners.  someone else also told me to
put a box in every corner, if your food isn't in a corner of the cage.  good
luck.
 
Jay, Sue, and their zoo :)
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[Posted in FML issue 2369]