I adopted two kitties about 7 years ago. One a siamese and the other a calico. I've had them since they were kittens. (The callie was saved by my vet tech friend and she convinced me to take her.)
Anyhow, so they were tiny when I adopted them. Well, whenever I let the ferrets out of their very large cage the kittens would head in there! They would check out the whole place, the three levels, and they would munch on the ferret food. The would even sleep in the ferret hammocks.
To this day they still love ferret food. We have a bowl of it in our bedroom for when we let the ferrets run. The cats come in periodically and munch on it. So cute!