That ain't chicken boxing.
It's cock fighting. Usually to the death. Which gets the PETA folks wound up tighter than a banjo string. I once installed and certified a fire alarm system in a high tech cock fighting arena. They had a CCTV camera above the main pit so patrons could watch the fights while eating in the snack bar. It was open for business one night. Got busted for illegal gambling.
The owner thought he was being slick by calling it a Sportsmans club.
I got those dagger eyed looks when I stopped to ask directions to the place.