Scientists at the Max Planck Institute of Colloids and Interfaces have identified a remarkable capability in terrestrial snails native to central Europe: the ability to produce multiple types of mucus with distinctly different properties. According to findings published in the journal Science, brown-lipped snails adjust the proportions of proteins and ions in their secretions to create five separate varieties of slime, each serving a particular biological purpose.
The research identified the specific functions of each mucus type. The snails produce a lubricating slime that enables them to move efficiently across surfaces, combining adhesion with minimal friction. They generate two varieties of defensive mucus—a foam substance to expel small parasites and a sticky glue to immobilize threats. Additionally, the snails create a protective mucus that seals their shells during winter dormancy, and an adhesive mucus that allows them to attach to diverse materials including wood, glass, and aluminum.
The investigation revealed that while all five mucus varieties share similar protein compositions, the concentrations of these proteins differ significantly between types. The presence of calcium and other ions, combined with variations in secretion methods, accounts for the distinct properties of each slime. Higher concentrations of collagen and calcium, for instance, produce stiffer and stickier formulations, while protective winter mucus contains calcite crystals that create hardness and brittleness suitable for a mechanical barrier.
The findings hold substantial potential for materials engineering and biomedical applications. Researchers suggest that understanding snail slime production mechanisms could enable development of new adhesive compounds for wound closure, drug delivery systems, cosmetic formulations, and improved catheters with reduced friction. Materials scientists indicate that nature’s solutions to these biological challenges may offer innovations currently beyond human engineering capabilities.
The study involved collecting snails during rainy weather near the research institute and inducing mucus production through controlled stimulation, then analyzing the chemical composition of each secretion type to determine the underlying biological mechanisms.
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