From Wikipedia:
"Cooper presumed that, because the chicken had wings, it would be able to fly. He picked it up and threw it out over the crowd, expecting it to fly away. The chicken instead plummeted into the first few rows occupied by wheelchair users, who reportedly proceeded to tear the bird to pieces."
"The next day the incident made the front page of national newspapers, and Zappa phoned Cooper and asked if the story, which reported that he had bitten off the chicken's head and drunk its blood on stage, was true. Cooper denied the rumor, whereupon Zappa told him, "Well, whatever you do, don't tell anyone you didn't do it."
Going on 72 years he still kicks butt on stages, golf courses and speaking venues and has always been Christian. Troubles, alcoholism, some drugs but eventually clean, still creative, positive and giving.
Almost forgot - never throw live birds to wheelchair users.
"As GOD as my witness...