Archaeological excavation also found that the snail shells in the early stage of the site were relatively thin, and the species were mainly large and round snails. In the late period of the site, the snail shells were thick, and the species were mainly medium-sized snails with symmetrical shapes. Experts speculate that this may mean that the way and purpose of the ancients to obtain snail resources have changed. Zhu Zhonghua, deputy director of Yunnan Institute of Cultural Relics and Archaeology, said that the ancients lived near lakes and rivers and used a large number of aquatic products as food sources. The site of Gucheng Village is located on the southeast bank of Dianchi Lake. Historically, Dianchi Lake is famous for its rich snails. Eating snails can supplement protein. This dietary tradition has been passed down from generation to generation. There are common snails, Moushi snails and reticulated Chinese snails in the site of Gucheng Village.
At present, the snail is only distributed in Dianchi Lake. Common snails are distributed in Dianchi Lake in Kunming, Erhai Lake in Dali, Chibi Lake, Haixi Lake, Jianhu Lake and other places. They are national second-class protected animals and are assessed as "endangered" by the World Conservation Union. Reticulated huajuan basically disappeared in Dianchi Lake, and now it is mainly distributed in some Longtan in the south of Dianchi Lake. In addition, in many places in Central China and South China, snails and snail-like species are collectively referred to as snails. These freshwater snails are widely distributed, and they are people's daily favorite ingredients, such as China round snail, China round snail, stone snail and so on. Among them, the stone snail has the widest distribution, the largest output and the highest "appearance rate" on people's dining tables.