there are lots of potential reasons. one of the more interesting: say you know a big game hunter. he goes to africa and kills a lion. he comes back and wants to get the head of the lion mounted. he gets it in a scary pose, and hangs it in his den. why? to show people how intimidating and powerful that creature that HE defeated was. it's a tribute to the lion, but it's also a tribute to the hunter who killed it, for he must be very strong indeed if he defeated it. now if that isn't an awesome allegory, i dont know what is. Treebeard... honestly...i'm very impressed. You should come to Law School with me. That is a MASSIVE stretch, but a very good one. it probably is a stretch, but then it's not like anyone is saying that they did this consciously, so who knows. another likely reason for their establishment is the fact that due to the stereotypical dance and dress they are given, it'd be easy to pick them out and recognize them from a distance.