(CNN) If it were a movie pitch, it would be "Chicken Run" meets "Kill Bill."

When a hungry fox snuck into a chicken pen at an agriculture school in northwestern France, it got a lot more than it bargained for.

On their morning rounds Thursday, students at Le Gros Chêne school in Brittany found the fox's lifeless, mutilated body lying in the corner of the pen.

"There, in the corner, we found this dead fox," Pascal Daniel, the head of farming at the school, told the Agence France-Presse news agency. "There was a herd instinct and they attacked him with their beaks."

The fox is believed to have become trapped inside the chicken pen by light-controlled sensors that close the doors when the sun goes down, leaving it at the mercy of the angry mob.

Read More