I'm not sure how I can suspend wire across the 50'x50' expanse out there...but I have thought about it.
I have taken some precautions like Busch Gardens has done at their place - I have run fishing line about 18" apart across the top...and I've hung cd's from them as well - and so far my 5 big...
My chicks are currently 3 and 4 weeks old, and are in my Lowe's Playhouse coop with a fenced-in/roofed-in run, and has hareware cloth burried 12" around the perimeter. They are as safe as they can possibly be in there.
The girls have bigger digs waiting for them....but the "big girl" run...