Largest wild reindeer herd

The world's largest herd of wild reindeer or caribou Rangifer tarandus is the George River population of northern Canada, but it is greatly endangered. In 2011, it contained just 50,000 deer, whereas in 1992 it contained between 800,000 and 900,000 deer. Large engineering projects that separate the reindeer from their calving grounds have been blamed by some environmentalists for this very dramatic fall in numbers during the past decade.