Alaska has one species of Caribou, the Barren Ground Caribou. There are 32 distinct herds in Alaska. These bulls are part of the Nelchina herd, the herd found along the Denali Highway. In order to get a good photo of a bull Caribou one needs to be afield in the breeding season. That is when the bulls are in their "breeding colors", and the fall foliage is at it's best. All one needs do then to collect photographs is locate some bulls, then keep up with them! Bull Caribou do not defend a harem as many of the deer species do, they defend a breeding space around themselves. In short, they move with the cows, which are always moving. You better have your track shoes on to photograph bull Caribou!