When you visit the Salt Lake in Yuncheng city, north  China's Shanxi Province these days, be careful not to step on wild bird eggs! /CFP Photo

May to July every year is the season for birds in the area to lay eggs. /CFP Photo

The eggs are believed to belong to the avocet, a bird which has long legs and sweeps its long, thin, upcurved bill from side to side when feeding in the brackish or saline wetlands. /CFP Photo

The wetlands along the Salt Lake have become a paradise for thousands of birds in the summer time. /CFP Photo