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The vast majority of species has (right-handed) shell. individuals are extremely rare in snails. Here is a very nice citizen science project investigating the developmental origin of this . biology
📄 Davison et al. (2020) Internet ‘shellebrity’’ reflects on origin of rare mirror-image snails.’ Biology Letters 16:20200110 dx.doi.org/10.1098/rsbl.2020.0

@fxdm Thanks for the link. Interesting read on 'Jeremy' and its offspring.

@fxdm Nice! I remember something about right- and left-oriented snails living on an island with some species of snake having teeth adapted to extracting a right oriented snail from its shell.
As a result, there's a gradient of number of left-oriented snails according to the number of snakes. Such fun

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