This might seem like a stupid question, but i recently flew out of the Jackson airport (I live in eastern Idaho) back east to visit the family for Christmas. Driving past the refuge I couldnt resist and had to pull over and glass over the herd out in the refuge. Man there were some absolute giant bulls in there! My question is do all of those bulls migrate down off the hill or do some of them live in the refuge all year? Just curious, thanks for your time...