hi everyone! This post is about my two cats,

My two cats, they are brother and they have been outdoor/indoor cats now for about two months and at first it was nice I was okay with it, but it's gotten weird ! They won't stop killing things! My cat Caitlyn brought home a lizard a few weeks ago and I don't know which one it was that's killed a darn crow! And now this morning I walked into my room and there's a featherless bird dead on my floor! I want it to stop!! Any of you cat lovers ever had to deal with this and how did you resolve it? My boys are sweethearts and have never shown to be vicious I don't like these little animals being killed! Please respond to help me get through this haha!!
Those are my boys! Caitlyn is the black cat and baca is the one with a spot on his nose