I agree wholeheartedly with Nigel in terms of Canadian wildlife. Just looking at carnivores and omnivores there are black bears, grizzly bears, polar bears (up in the far north), lynx, bobcats, mountain lions, wolverines, fishers, martens, weasels, otters, mink, ferrets, wolves, coyotes, badgers, raccoons, and at least 5 different species of fox. Outside of North America many of those animals can never be found in worldwide zoos.
There are also wonderful opportunities to see hoofstock such as rocky mountain goats, bighorn sheep, dall sheep, bison, moose, muskox, pronghorn antelope, caribou, mule deer, white-tailed deer and elk. I've driven across most of Canada and have seen a large amount of amazing wildlife just from looking through the windshield.