Today,thank to nature loves,some of world is endangered animals are actually growing in number. Years ago,for example,people who felt that wolves were dangerous killed so many wolves each year that soon they were almost gone . Nature loves grew worried. They did not want the wolves to disappear. Laws were passed to protact the wolves that were left .Wild wolves were captured in Canada and let loose in U.S. forests . Scients kept track of the wolves to make sure they would live .Soon ,wolf packs began to roam the forests of the Midwest.