http://www.theverge.com/2016/8/29/12690 ... hy-science


How did lightning kill all of those reindeer at once? Did they need to be touching for this to happen?
When animals or people are in groups, most are being killed by the ground current. First, there’s a direct strike — this is what most people think of when they think of lightning — that hits the tree or maybe the ground nearby. The energy then spreads along the ground surface, and if you’re anywhere near that lightning strike, you absorb it and get shocked.
Lightning goes up one leg and down another. Animals are more vulnerable because their legs are spread out more, so the ground currents travel more easily in their bodies. It doesn’t matter if they’re touching, or exactly how close they are, it matters that they were all in the area hit by lightning. Ground currents are the thing that’s responsible for the most lightning deaths and injuries in both people and animals.




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