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9 of the world's largest animal swarms

By: Bryan Nelson on Dec. 23, 2013, 1:07 p.m.
Mosquito swarm, University of Alaska Museum of the North

Photo: Eric Carlson/UAMN

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You might think that the best time to visit the chilly Arctic tundra would be when the weather is nicest, during the spring and summer. But one look at this terrifying video is sure to change your mind on that front.

The video depicts a scientist virtually engulfed in a massive swarm of bloodthirsty mosquitoes. Swarms of this size can be relatively commonplace when the weather warms and the permafrost thaws, and the mosquitoes emerge from their eggs en masse.

The swarms are so invasive that they have even been known to drive the movements of caribou herds.