MISSOULA, Mont. (AP) — Research in Montana finds that aggressively dealing with wolves that kill livestock works better than a gradual approach.

Montana Fish, Wildlife and Parks biologist Liz Bradley says her research found that since killing livestock is a learned behavior for wolves it's more effective for wildlife managers to remove more of the wolves earlier if that's the best option available.

Bradley tells the Missoulian that in the long run the strategy of removing a pack of wolves earlier actually ends up killing fewer wolves. She says that's because removing just a few wolves from a pack at a time over five or six years adds up.