Wolves usually travel in packs of 6 or 7, but in rural Russia a pack of 400 has been spotted. They have killed dozens of horses, and have elicited the local authorities to post bounties and form hunting teams to combat what some might call a "Beast War."
I'm of the opinion that as humans place greater and greater strain on the surrounding environment, the environment will eventually adapt to fight back. And it won't be pretty. And it looks like the war has begun.