As we walked through the grounds holding our cones of zoo chow, suddenly, like a tidal wave, a herd of 20+ sheep can walking very briskly and with great purpose around a corner and right for us. It was a bit disconcerting to say the least. They backed us up against the fence here and the ones up front cleaned us out of zoo chow in about 5 seconds. Then they allowed us to move on unharmed.