We put up sun shades around the aviary that keep the worst of the late sun off. But a fan on an extension cord plus a dinky little hose mister have been doing their part, too. Keeps the gals from panting, even on the 100+ F days.
Wishing luck to all you folks in hotter locales!
I freeze cake pans of water and put the resulting ice blocks near where the birds like to splay out. They never touch it (except to peck at it sometimes) but the meltwater keeps their wallowing spots cool during peak heat. Nabiki's got a great idea with the bottles. I wonder if you couldn't...