Students attend a butterfly class by Micreate, where they can observe the metamorphosis of butterflies and prepare specimens, in the Paleozoological Museum of China, Beijing, on Jan 31, 2015. [Photo by Ma Danning]

　　Children look at fossils and stones they collected, at Huiyu, a suburban village about 30 km from downtown Beijing that is rich in plant and mammal fossils, in November 2014. [Photo provided to chinadaily.com.cn]