We have used limits for our conures (one named Reo) but they prefer their water bowls! I gave up and when I see them trying to bathe I just add more water. One of ours-now departed-liked to stand on one of the larger ladders placed across the sink while I ran a small stream of water. He’d play for several minutes. Regards. Pkt

It will be good for one bird at a time. It worked ok for my cockatiels. 

a macaw will probably not fit in the bird bath, it is for medium to small size birds.

it can attach to most any wires so as long as your door is a wire cage material, yes it can. Just keep in mind when you swing the door open or shut water might splash out.

simply attach the clamps/brackets to a cage wire, these are great for Parakeets and many people use as a food dish as well.

Thank you for your question. The Quick Lock Bird Bath is appropriate for cockatiels.

I have mine inside the cage. But since my Pionus prefers a shower (we spray him when the vacuum cleaner is running, see my review), I use it as a fruit and veggie tray.

It is a perfect size for our green cheek conure.

Hi there! I don't know if you still need an answer, after 10 months to your question about the bird bath from Dr. fosters and Smith or not. I can tell you this, my cockatiel's cage is also a custom-made cage of some kind of very hard wire that has rectangles which are not large and it fits thru them just fine. How it works is there is a small bolt that goes through the opening of the cage from the inside and then you place a provided washer and butterfly toggle nut on the outside and screw them down until its nice and snug and you are done. Voila! Bath time. Hope this helps

No. It is only available in one standard size. It is best suited for smaller birds.