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The snail’s shell diameter averages about 22 to 30 millimeters (.87 to 1.18 inches). Each snail’s shell has a unique combination of stripes and colors, so no two are exactly alike. These snails eat ...

"I am going to withdraw from the world," says a snail in Hans Christian Andersen's tale The Snail and the Rosebush. "Nothing that happens there is any concern of mine." In the fall, snails get cold.

They're neither white and gold or black and blue. But in an optical puzzle akin to The Dress, colourful snails are causing scientists turn to technology to definitively decide whether some snails' ...