You can't step on the snail ball because there are many small snails in it. Bullacta exarata is a hermaphrodite and allofertilized animal. After laying eggs, the eggs are wrapped by colloidal capsules and aggregated into grape-shaped eggs, and colloidal stalks are attached to the beach sediments. After the development of fertilized eggs, the larvae burst out of the sac and lived in water. After about 4 days, they became small snails and crawled on the beach. Bullacta exarata belongs to mollusca (the only kind of bullacta exarata) and is a special product of seawater and salty fresh water on the west coast of the Pacific Ocean. Bullacta exarata is mainly produced in China, Liaoning, Ningbo and donggang city. Bullacta exarata is an omnivorous hind gill animal, which can swallow sediments and scrape algae. It mainly feeds on eggs and organic humus of benthic diatoms, small crustaceans and invertebrates.