Field snails will be at the river in April. April is the time when field snails appear, and they will be found in large quantities at the riverside in April. Field snails are widely distributed in freshwater lakes, reservoirs, rice paddies, ponds and ditches all over China.

The shell of the field snail is calcareous, thin, spiral, and right-handed. The shell exterior is yellowish green to yellowish brown, the color varies depending on the environment and water quality, the inner surface is grayish white, the top of the shell is slightly pointed, the bottom of the shell is inflated, the mouth of the shell is ovoid, and its edges are intact and angular.

Other profiles of field snails.

The main feeding organ of the field snail is the toothed tongue, which is used to scrape underwater and epiphytic food. The snail is omnivorous, and in the natural environment, it mainly eats aquatic plants, young stems and leaves, algae, bacteria and organic debris, etc. It also feeds on zooplankton, and prefers nocturnal activities and feeding. Snail in the water temperature of about 15 ℃ to start activities and feeding, the optimal temperature for growth of 20 ~ 28 ℃, 30 ℃ or more, the snail will shrink the flesh into the snail shell, clustered in the shade or submerged in the soil to avoid the summer heat, water temperature of more than 40 ℃ snail will die.