The Center for Biological Diversity want to protect wolves from being killed by cattle ranchers by instituting tighter rules around the use of things like flags hung on fences to scare predators, flashing lights, livestock guardian dogs and range riders, as well proof these have been used — and the removal of dead animal carcasses away from herds — before CPW will issue a permit to kill a wolf confirmed to have killed livestock. Wolves are essential to healthy ecosystem, and cattle ranching is the number on threat to healthy ecosystems across the western US and in many areas throughout the world.