My buddy (Thundering Bull) trains his cats to be afraid of his birds. He has an African Grey Parrot and a Nande Conyer.

The Grey was taught to be hand feed only with the use of a chain mail welding glove.

The kittens were trained by letting the bird nip their tails. No skin broken mind you.

I watched that bird take on a grown German Sheppard! Guess which one got the bloody nose.

Of course he could never defend against multiple cats at once (Thundering Bull has five in the house) or a concerted attack by the dog.

I would not encourage them to play together myself. You can't totaly predict what will happen when your back is turned.

Teach them to fear each other a bit and let them be happy in their own world in the same house. Close adult supervision is needed when interaction occurs.

Better safe than sorry here.