Never Cry Wolf by Farley Mowat

From chapters.ca:
Hordes of bloodthirsty wolves are slaughtering the arctic caribou, and the government's Wildlife Service assigns naturalist Farely Mowat to investigate. Mowat is dropped alone onto the frozen tundra, where he begins his mission to live among the howling wolf packs and study their waves. Contact with his quarry comes quickly, and Mowat discovers not a den of marauding killers but a courageous family of skillful providers and devoted protectors of their young. As Mowat comes closer to the wolf world, he comes to fear with them on onslaught of bounty hunters and government exterminators out to erase the noble wolf community from the Arctic.