Perhaps the most numerous of large terrestrial animals are the Caribou. The North American caribou and its Asian and European cousins are migratory animals and during migrations, they can form herds up to half a million strong. Millions of these animals roam the arctic tundras of the world, but if global warming and industrialization continue, their numbers could shrink as drastically as those of the American buffalo; at one point they too roamed the grass lands of North America in herds hundreds of thousands strong.
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