Hi we have 2 cats both females and 1 of ours is a bird killer, she is always locked in at night. She used to catch between 2-3 birds in a week, have you every awoke to hear a bird screaming for its life, its the most horrible sound. Yes she brings them in alive and lets them fly around the house. In the end we got her a sonic cat coller from Pets at Home for �9.99. Which works great for us, every time she pounces a light goes off and it makes a beeping sound. She catches about 1 a month now if that. I dont know if it will work for your cat, but its worth a try!