"On May 5, competing for miscellaneous drugs can cure all diseases." There is a record of catching toads in May in Qi Yao Min Shu Miscellaneous Notes, which is also used in pharmacy.

Later, many areas have the custom of catching toads on the Dragon Boat Festival. People believe that toads are highly toxic and can clear away heat and detoxify, especially the toads caught during the Dragon Boat Festival are the most toxic and have the best quality. This custom of catching toad medicine originated from the legend of "toad fighting soldiers" in Han Dynasty.

That's why the toad can't hide from May 5th.