Hypnotism, the chicken will eat the marble by choice.

Wait silently in a trash can and stalk the chicken. In the dead of night jump out and assrape it! once is squaks for help shove them in and use a stick to force them down. /evil

cut their head off and shove it down its throat

hmm well get paint ball gun put marbles up butt close beak and fire and taadaa you made a chickin swallow matbles

Or you made the first chicken silencer, as most off the marbles will come straight out the other end!