Pian Hai Lei Bian (Pian Hai Lei Bian) records it as the same as "tu". Shan Hai Jing Zhu (Shan Hai Jing Zhu) records that in the mountains southwest of Shouyang County in Longxi, there is a bird and a mouse living in the same cave. The bird's name is ying, and the mouse's name is tuo.