Reindeer cyclones are as strange, mesmerizing as they sound

Caroline FloydMeteorologist

Stunning aerial footage shows this unusual defense behaviour.

Meteorologists may have to step aside on this one: There's a new kind of cyclone in town.

Or, perhaps, a very old kind of cyclone, but caught on camera for the first time. While working on a documentary that recently aired on PBS, "Wild Way of the Vikings," filmmakers captured stunning footage of a herd of reindeer displaying defensive behaviour in response to a threat, and the behaviour in question bears a startling resemblance to the kind of weather cyclones we see on satellite.

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When faced with danger, herds of reindeer stampede in these spinning spirals, making it next to impossible for any predator to target a single animal.

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According to LiveScience, this kind of stampede has also been observed in herds kept in corrals, provided there are at least 20 to 25 animals in the group. A study published in 2002 found the animals would beging "milling in response to stressing events" and -- oddly enough -- the swirling stampede always "rotated leftwards", or in a counter-clockwise direction.

Sources: PBS | LiveScience | Rangifer |

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