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Hundreds of black caterpillars make strange writhing circle formation

Hundreds of caterpillars were seen moving strangely in a writhing ring formation in a woman's yard in Lai Chau Province, northern Vietnam. According to the filmer, she saw a strange black circle in front of her yard on December 7, 2018. As she approached she saw the caterpillars were not moving in a straight line but are moving in a circular pattern. The insects were moving and narrowing the circle. This reportedly was the first time she saw the caterpillars moving in this way.
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