Another technique is hunting using ferrets, wherein ferrets are deployed to chase the rabbits out to be shot or into nets set over the burrows. Since the number of rabbits ferrets can kill is limited, this is more a hunting activity than a serious control method. Although ferrets and other mustelid species are used as control measures, Australia has significantly fewer wild mustelids to prey on the invasive rabbits while in their warrens or burrows compared to Europe and the United States.