This is a separate visitors attraction.  They are the only wild cattle in the world, sole survivors of herds that once roamed the forests of Britain.  Once they were held sacred and pre-Christian pagans sacrificed them to their gods.  Later in their history, this herd both defended and fed the Castle.  These animals are still potentially dangerous and only visit them with the Warden. 

The Warden will take you as close as safely possible and explain their more recent history and way of life. Remember, they are more rare than any endangered Panda or Mountain Gorilla, and are simply the only wild cattle in the world.  They have their own website which is  www.chillinghamwildcattle.com. There are joint tickets available at a discounted price at both attractions.