The scientific community would have you believe that snails come in many, many different varieties, but there’s a much simpler way to classify them: pesky and not pesky. Your typical garden snail ...

The great pond snail is helping scientists make great leaps in their understanding of asymmetries in the animal kingdom. Paul Starosta/Corbis Whether it flies, walks or swims, nearly any given animal ...

Mollusk mystery The tree-snail oddities are three-fold: The multi-island distribution of this snail species is unique for tree snails in the Partulidae family, which typically are restricted to single ...