The mountain climbing on the back of Gulu Village, Sanhe Town, Sandu County, Guizhou, is very strange. The mountain is full of trees, and only a cliff wall is exposed on the mountainside. What's more strange is that this cliff wall is covered with sunken stone nests, and these stone nests will automatically fall out of stone eggs similar to dinosaur eggs after 30 years. So locals call it egg-laying cliff, why does the stone give birth to eggs? In 2009, Sandu County offered a reward of 500,000 yuan to collect decipherers, but there is no conclusion yet.