finchmix22 -- Ditto on being curious about your air system! I could definitely use one of these!
Agreed with the others that some cats are definitely more trustworthy than others, both with birds and small animals.
But I've seen for myself how a trustworthy cat can turn into a tyrant. All it takes is giving in to those instinctual urges once and they realize how delightfully rewarding the "hunt" is. (Plus, they learn from each other, so seeing another hunt-driven cat can ruin that docility.)
For this reason, I'd never fully trust a cat around a bird 100%, even a large bird who could act "scary" and theoretically defend itself.
But I definitely have some whom I trust
supervised around the larger birds and when I had fewer cats, I'd let them interact with some of the smaller ones too. (Now, I have a zero cat policy in the bird room and I don't bring the smaller guys out.)
I think it's just important to remember that cats are cats, not a small kid in a furry suit. And as a cat, they have certain tendencies. The same is true of dogs. Underneath all the training, they are dogs, not little humans. That's hard to remember sometimes, especially for people like me who humanize animals.