Scientists at the Max Planck Institute of Colloids and Interfaces have documented how brown-lipped snails, a terrestrial species native to central Europe, produce multiple varieties of mucus with distinct characteristics. The findings, published in Science, reveal that snails adjust the relative proportions of proteins and ions to create five different types of slime, each suited to particular purposes.
The research identified these five mucus varieties and their individual functions. A lubricant slime enables locomotion by allowing the snails to adhere to surfaces while moving with minimal friction. Two separate defensive mucuses serve protective roles: one generates foam to wash out small pests, while the other creates a sticky substance to immobilize threats. A protective mucus enables snails to seal themselves inside their shells during winter hibernation. Finally, an adhesive mucus allows snails to cling to various surfaces including wood, glass, and aluminum.
PhD student Mariella Gabler and her team analyzed snail mucus samples to determine their composition. The researchers found that while all five varieties contain similar proteins, their concentrations differ significantly. Variations in calcium levels and other ions, combined with differences in secretion methods, account for the distinct properties of each mucus type. Notably, increased collagen and calcium content correlates with stiffer, more cohesive, and stickier mucus, while protective mucus contains tiny calcite crystals that provide hardness and brittleness suitable for mechanical barriers.
The findings have potential applications in materials engineering and medical fields. Researchers suggest the lubricant mucus could inspire catheter coatings to reduce friction during insertion into the body. The adhesive properties might be adapted for wound closure applications. Materials scientist Kausik Mukhopadhyay noted potential uses in cancer research, drug delivery, and cosmetics development, emphasizing that nature’s biological engineering remains far more sophisticated than current human capabilities.
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