The .... (I don't know what these are) ... of Tongeren

In the middle of the city, there was a pen. A fenced in pen close to the man made (I'm assuming) lake in the panorama yesterday. Inside the pen was this interesting "deer like" animal. I say interesting as an ignorant Canadian who really doesn't know what a Belgian equivalent to deer (or similar species) are. I haven't spend any time looking it up either so ... I guess I have no excuse.