The survival strategy behind "Reindeer Cyclone" herd behavior

From afar, this video almost looks like a group of ants circling round and round. If you take a closer look though, you'll see that this is a huge group of reindeer in what's sometimes known as a "Reindeer Cyclone". It's hypnotizing and beautiful to watch Reindeers do this, but there's a survival-based reason why this happens. — Read the rest

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