Thank you so muchI have clay soils too.
The French Mulberry/American Beautyberry (picture from my property) is fast growing and does well in the clays. The birds like to dig hollows under it in the heat, and seasonally, it provides entertainment as they jump and flap and pluck the berries.
There are a lote of plants that do well in clay soils, zone 8 - sadly, most tend towards thin and spindly (Salvia, cone flowers, black eyed susans, etc). You might also try Hostas, Bee Balm, and Sedum - I haven't, though I've heard good things.

I'm writing this all down in my note pad
I agree that Free Ranging and Hawks as well as other predators such as fox means accepting the risk of predation. I have nice large covered pens for my birds and there are ways to entertain the birds even in pens. I got tired of loosing birds to predators. Many lessons learned the hard way. This is what one BYC member did to protect her birds. Good luck...
