Is it possible to have a indoor pond with a bird? a bird no bigger than a pound? and have it still stay clean?
If the bird is a duck or goose I'd say no, you wouldn't be able to keep it clean. Plus, I think you'd have a huge humidity problem in your house. Let us know how it goes!
It really depends on the bird. If the bird is one that spends most of it's time in perches, then I think you would have an easy time keeping an indoor pond clean (It would essentially be like an open fish tank) If it is a bird that spends most of its time in the water, then I think you would need some heavy, heavy filtration to keep the pond clean. Also, size would be a factor. Smaller ponds dirty quicker and may need heavier filtration. Where as a larger pond will also need more filtration for the larger volume. I imagine you would do some neat aviary type things with small ponds in the aviary. It would just mostly depend on what you had in mind.