These are mainly a specialty menu item for wolves in Yellowstone's interior. One pack in particular, the Mollie's, makes its living bringing down these feisty giants.
Much smaller than elk, one deer isn't a feast for a wolf pack. But as the number of elk on the Northern Range (Yellowstone's northeast corner) has fallen, the number of deer consumed has risen.
Though a big meal, wolves have only consumed 54 since 1995. I imagine that bringing down a large animal with hefty hooves and awesome antlers is not inviting.
Pronghorn, Bighorn, Mountain goats
Built for speed, pronghorn can out run wolves, and wolves have brought down only 29 since 1995, most likely calves or ailing older animals. Bighorns and mountain goats tend to hang on cliffs where hungry wolves are at a distinct disadvantage.
The Wolf Project records other animals wolves consume. Most are so small that I would list them on the menu under "starters." These include beaver, badger, rabbit, otter, skunk, porcupine, weasel, grouse, and even one owl killed in 1999.
The project also lists competitors killed - and usually not eaten - by wolves. Coyotes top that list with 88 eliminated since wolves returned. Though one researcher watched a wolf pack attack a coyote den and kill pups, most coyotes die while scavenging wolf kills.