Wolves used keep nature in balance ie killing Bison, deer, coyote, fox, rabbits etc. Wolves received their eviction notice so all others multiplied bringing an overabundance of smaller prey and disease. So now they slaughter coyotes and the deer are showing up with cwd and the raccoons have rabies. Similar to ocean town of Wilmington, NC where feral cats through programs were captured, tagged/neutered/spayed and released and the rats were kept at a minimum. A few years ago now that program has been stopped and the rats have become a problem again.