Do caribou migrate for weather or food?
Certain weather conditions, such as the first severe storm in the fall, stimulate caribou to migrate toward their winter ranges. After the calves are born in the spring, all the caribou in the herd come together on the summer range. For large herds such as the Porcupine Caribou herd in the Arctic National Wildlife Refuge, the caribou must keep moving so they don’t eat all the available food.
