DH and I adopted a lovely little rescue cat a couple of months ago. We adore her, but it turns out she is a serial killer, to say she is prolific would be an understatement! Every morning without fail we wake up to find at least one body but often it's two or three. To make matters worse, she frequently fails to finish the job so one of us then has to start the day by putting a severely injured bird/small animal out of its misery 
. We then come home from work in the evening to find more! She has brought 4 bats and a bird into the house over the last 48 hours alone!
Has anyone else had a cat like this? We've had cats before so fully expected to deal with the odd bird or mouse here and there, but we've never known a cat hunt this much, or so successfully! Dealing with the aftermath is starting to feel like a full time job, on top of the full time jobs we already have. The other evening, unbeknownst to us, she brought in a little bird only to lose it and despite being maimed it managed to escape behind a large and very heavy piece of furniture we'd fixed to the wall for childproofing reasons. By the time we'd figured out where the cheeping was coming from, unfixed and moved the furniture, retrieved the poor thing and put the room back together again it was gone midnight.
I know it's probably a long shot but is there any way to discourage a cat from killing off all the local wildlife? I thought about a collar with a bell but she likes to climb trees and I worry she might end up hanging herself. Any advice would be much appreciated.