How do I stop my cats from killing wildlife - Bumkins Toddler Gift Set - Tee and Bib - Dr. Seuss Cat In The Hat

Firstly, praise for worrying about it at all, so many cat owners do not.

Your cat hunts by instinct, and will continue no matter how well fed it is. Belling the cat will help for a while, but the cat will then learn to stalk without moving the bell, and will not worry about that at other times, giving you the impression that the bell works as intended.

Really, the only way is to keep the cat indoors at night. During the day it is much more visible, and the wildlife has a better chance.
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A big bell around there neck ???? or keep in a really big wire cage when not inside. and may keep the neighbors happy no plops in gardens.