I have 3 indoor cats. One, Cara is always after mice that come in under the stove. Tonight I had the chicks in a small bin on the couch so I could socialize with them. She came in and fell asleep on the back of the couch but never gave the chicks a second look. My big male Dapper likes to sit or lay on the brooder lid, but I'm pretty sure it's a heat thing since he has never shown much interest in other living things. Interestingly the one I'm most worried about with the chicks is my declawed cat Princess. She watches their every move whenever I have them out and I can just see she is thinking chicken nuggets!