Wolves' mainstay meat is not caribou or any large mammal. Rather, they have the sensory equipment to hunt for small rodents, particularly under snow. It is believed that there is one item of prey which is never far out of reach; the somewhat small, but numerous menu filler, the lowly mouse.
Perhaps mousehunting hones important skills for caribou season.
The wolves wait and watch for the caribou.
The wolves who venture farthest north, who see them first, howl the info southward, and the nightly news keeps the wolfpacks all abreast of the caribous' migratory progress into wolf territory.
Until then, there's meece on the menu every evening.