Macaws especially should be separated from Old World Parrots as they are most sensitive to air-born particles.

https://www.google.ie/url?sa=t&source=w ... ZNgRxkwtPA

My understanding is that there isn't a problem with all Old World parrots, but the "dusty" birds (cockatoos, cockatiels, African greys) are hazardous to the lungs of macaws. The dusty birds are the species that have powder down, which means down feathers that crumble into a powder that they spread on their feathers for grooming purposes.

These are also the same parrot species that don't have any green coloring in their feathers, which is probably not a coincidence. Green and blue coloring in birds is actually an optical illusion caused by the way light reflects off the black or brown melanin pigment in the feathers. Coating the feathers with powder down probably interferes with this effect, and that's why the parrots with green or blue feathers don't have powder down.

Have you ever watched a cockatiel fluff its feathers while sitting in a shaft of sunlight? The dust cloud that you can see rising up off the bird is very impressive.

And now I'm thinking remember I was saying a Macaw and Toucan dropped dead in my pet store maybe that was because there was lots of budgies in the aviary next to it and then it died, it was a scarlet macaw.

Budgies aren't dusty birds so they shouldn't be a particular problem for macaws. I haven't heard of toucans having a special problem with airborne particles, but they do have a lot of trouble with iron storage disease.

Budgies are Old World Parrots I always thought they were dusty because they come from Australia in the dusty parts.

They come from the Australian Outback which is a dry and dusty place, but it doesn't mean that they're dusty birds. The birds that are hazardous to macaws are the ones that produce powder down - the cockatoos, cockatiels and African greys. They tell you this in the link.

Yeah I know I just always thought Budgies had power down.

What about Mango? Is he a dusty bird

No, it's just the cockatoos, cockatiels and African greys. Parrots that have green or blue feathers don't have it. They'll have SOME dander of course, but not as much as the ones with powder down. I've had petting sessions with a friend's cockatoo, and afterwards it looked like my hands were coated with powdered chalk.

But New World Parrots have no dander at all? Mango would be a Old World Parrot right?