Symmetry is a feature of many plants, animals and even some molecules -- like water. But that's not the case with snails and their coiled shells. They are chiral -- asymmetrical in such a way that ...
It is carrying the broken shell of a garden snail, Cornu aspersum. The damage to the latter looks like it was sustained by a thrush breaking it. The Cepaea must have accidentally picked up the broken ...
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