Introduction to the ancient animals of Hezheng: In the Miocene century between 24 million and 5.2 million years ago, the Linxia Basin once had a subtropical to warm temperate climate environment. The basin was dotted with lakes, winding rivers, and lush vegetation. , with birds singing and flowers fragrant, it was a paradise for various animals to thrive in ancient times. Affected by the uplift and changes of the Qinghai-Tibet Plateau, the climate gradually became colder and the environment became increasingly harsh, resulting in the formation of today's precious vertebrate paleontological fossils.