They are the Ace Predator on ungulates. These re-planted BC wolves have killed a minimum of 20,000 ADULT elk in Wyoming in the last 15 years - considering calf numbers and adolescents as well, could easily be 50,000 elk altogether - likely more.
That is the result of a 24,000 herd in 2000, being reduced to less than 4,000today. Considering through the years of # drop, from 3,000 to about 15,000 minimum #'s of calves surviving birth per year - well, my numbers are way too low. You do the math.
That is with only a few packs still in the Park and surrounding areas. The rest have spread from Michigan, Oregon to Washington and now 2 pairs were reportedly seen in Northern California.