While they may "prefer" elk. Wolves will take watever fawn/calf is available. The fact that the wolf population has dropped in the park along with the elk numbers could very well be a result of them leaving the park for other herds. Those park herds don't all remain in the park year-round. And the wolves follow.
Now a wolf can decimate your livestock....but you can't shoot it without getting fined 22K. Fabulous. So farmers will shoot them or poison them as before, and not brag about it.
