A slow-moving river of millipedes crawling on the ground in unison was recently spotted in a mountainous area of Taiwan and the video of it is enough to make your skin crawl.

On April 27th, tourists visiting Hsüeh-Pa National Park in central Taiwan witnessed an unusual phenomenon that local guides have never seen before. While accompanying a group of seven tourists through an area west of Dalu Forest Road, Yang Xiaozhong, a tour guide with an experience of 11 years, noticed that the path he knew seemed to be covered with fallen leaves. At first, he thought the brown leaves must have been brought to the ground by heavy rains but then he realized that the foliage was actually moving. On closer inspection, the leaves turned out to be millipedes, thousands of them moving in the same direction, like a living river.