*Update: I found this National Geographic video on YouTube, and it's much better than the photos I originally posted.
Rheas actually feature prominently in my half-written novel from last November's NaNoWriMo, especially the little ones. They're cute, aren't they?
Female rheas are shy, gentle birds. The males build the nests, sit on the eggs, and take care of the young. They will also take a piece out of anyone or anything that messes with their young family, and they move like a snake when they bite. First, they puff out their feathers and charge to scare the offender off. If that doesn't work, they fight.
They come in gray or white. The white rheas have blue eyes that look surprisingly human. I'm not crazy about this picture, but it's the only one I could find of a white adult.
I hope this helps.