Moon snails (Euspira heros) are a large round snail with a huge mantle/foot which not only extends out past their shell but envelops it as well. At times it covers all but the very top of its shell.

Many beach-goers in P.E.I. have likely seen moon snails before. But these sea creatures have a range of fascinating behaviours that may not be at all apparent behind their shells. Jeff Clements ...