I hung a treat stick on the side of the guinea pig cage. They seemed to fight over it. OK, they come in a 2-pack, so I put the other one in. They fought over *that* one. I guess it was bigger? They seemed to have calmed down about it now. I will say, watching the social interactions between two female guinea pigs in the same cage is a good distraction from what's going on in the world. Periodic fights for dominance, random chattering, squealing when I stand up because they think I might give them food... At least they make me forget for a few minutes...