Snow clam, scientific name is Northeast Rana, or Rana for short. It is a rare frog species that grows in the forests of Northeast China. It is called snow clam because it hibernates in frozen rivers and snow for more than 100 days in winter. In fact, snow clams have different names in different places. People in Guangdong call them snow clams, and people in Northeast China call them toad oil. Snow clams are a famous native product of Northeast China. The medicinal and edible snow clams are actually the fallopian tubes of female toads. It has been used for thousands of years in my country. It was listed as a palace tribute in the Ming and Qing Dynasties. It is known as "soft gold" and "animal ginseng" in medicine. The forest frog is shaped like a giant frog and grows in broad-leaved forests and mixed coniferous forests in the Xiaoxing'an Mountains and Changbai Mountains. It is also known as the "Four Mountain Treasures" of the Northeast together with bear paws, monkey heads, and flying dragons. Because they are caught in the snow in winter, they are also called snow clams. Each wood frog has a capsule in its stomach, which is like ointment and oil, and stores energy in it. In winter, when there is nothing to eat in the snow, the wood frog relies on the capsule in its stomach to maintain life. This survival capsule turns out to be It's the fallopian tube.