I'd agree with everything everyone else has said. Our Nanday is extremely loud, if she screams in your ear your hearing will be muted for a few hours! I don't think videos on youtube could capture how loud they are. I've taken videos of Miko and she sounds *so* much more quiet than in her presence. We live in an apartment and I thank God everyday that our neighbors aren't picky about her noise.
She's a total 'watchdog,' if *anything* is out of place or suspicious to her (suspicious groceries, reflections of light from cars going past (well she's worked on this issue but it used to *really* get her), a sound outside, a weird color -- she'll take it very seriously that it's her job to warn everyone in a 10 mile radius. Our UPS guy dropped off a package and remarked to me the other day that 'we sure do have a good guard dog in that bird there.'
She also has a loud excited sound, for example, we were gone all day today and upon returning she greeted us with several minutes of 'OMGOMGOMG YOU'RE HOME!!!!!' screeching. So yeah..know what you're getting into.
That said, she's the most cuddly, playful bird I've ever met, I'd say she ranks right up there with cockatoos in her cuddlyness and playfulness. She's very entertaining to watch, sleeps flat on her back every night, and is an all around nut job. And we love every minute of it.
One thing, if you live in the U.S., be aware that Nanday's are illegal in Tennessee. They can seize then on site and kill them. I didn't know this when we brought Miko home and our relatives are in TN making holidays...interesting.
Here our some photos of our goober:
LOVE the last photo of her 'Yes I'm loud, but oh so loveable'