oh we have been down this road before. We had a cat roaming around my parents house. It was getting in the insulation for the heating/cooling system and was ripping it up. It even had kittens in there. Dad bought a trap to catch it. We caught about 6 'possums in the trap and finally caught the little hair ball...dad put in chicken scraps to catch it. 4 Feline House does have a good point about the small animals being nocturnal. The reason why we caught so many 'possums was because we had to catch it at night...considering it was a hard core ferral... (Like Spencer's buzzsaw )

Good luck in catching the kitty!