I hate to see a bird in a cage. It is so very cruel. Birds are meant to be in flocks, and they would fly miles in the wild. I don't like to see any animal in a cage really.
We had 2 rabbits a few years ago - they had been pets belonging to my 2 GC, but their mother wasn't caring for them properly (and she admitted it), so I had them. I bought a brand-new double-sized hutch with 2 levels and a long run - but even that didn't seem right, so the hutch door was always open, and the rabbit had the whole garden - 80ft and secured all round - to explore. They loved it! They chewed our flowers, dug holes in the lawn, pooed all over the damned place, and terrorised out 2 cats!
But they were happy and free. Sadly, both have since died, but they had a lovely life.
I also dislike it when people have a dog, leave it at home, alone, all day. They are pack animal, meant to live in a pack with other dogs or at least with humans.