What a wonderful set up! Thanks for posting it.
You know cats get very sleepy intensely watching little prey animals and birds. They also get "hungry" (which I call Bitey-Bite). In life cats eat their prey after stalking and catching it.
When there is no catch or reward for stalking, they bite something else. Ours shred paper!
I'd try the kitty with a tiny plate of a few treats (5 or so) near the cage, for guarding her new friend. This may payoff if little Roo escapes some day.
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Weezie looking at petunias 8.25.2017
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