Two of nine American bison that escaped from Buzz Berg's Stevenson, Md. farm run from police and volunteers, on a tennis court at Greene Tree gated community in Pikesville, Md. Police herded the buffalo into the courts before herding them into a trailer and returning them to their farm.

An American bison tramples through the makeshift barrier of lawn chairs and netting, and knocks down a police officer on a tennis court at Greene Tree gated community Tuesday, in Pikesville, Md. A herd of American bison escaped from Buzz Berg's Stevenson, Md., farm and Police herded the nine buffalo into the courts before moving them into a trailer and returning them to their farm.

Volunteers on a tennis court at Greene Tree gated community in Pikesville, Md., try to herd American bison that escaped from Buzz Berg's Stevenson, Md., farm Police herded the nine buffalo into the courts before moving them into a trailer and returning them to their farm.

A herd of American bison idle on a tennis court after escaping from a nearby farm. Their lack of lateral mobility and opposable thumbs prevented them from rallying.