I know that you can get white beans in the canned foods section of most grocery stores they might be called navy beans. I don't know if you can get lentils in the same section or not, where I live, lentils are in dry goods. If you find either of them in canned foods, when you open them rinse them well to remove any salt that is in them. Dry lentils can be cooked with wild or brown rice for the bird.
While it is good that the cat is some what afraid of the bird, you still need to know that a scratch or saliva from a cat can kill a healthy bird. Not always, but it can. The main reason that you need to know this is that a lot of cockatoos like to wander around on the floor and they claim the whole place as theirs, so if it finds the cat it may attack or just pester it.





