I use to have an iguana, and I know this isn't a big bird, but my parents have a budgie. It was hard to keep those two away from each other. The iguana would aways try to get on top of the
bird cage to sun herself in front of the window. And the bird, who had unfortuantly lost his birdie friend, would always try to feed my iguana seeds! It was so weird. Toby, the budgie, use to sit on my iguanas back and follow her around the room when we let them both out at the same time (supervised, of course). I use to have some awesome pictures of them hanging out together but I don't have them on this computer.
But yeah, we kept them both in the same room and even though Toby is just a little guy he can really be loud when he wants too, and it never seemed to bother the iguana.