Snails with counter-clockwise twisting shells can waste weeks trying to mate with a clockwise one.

Most snails possess a shell which is twisted clockwise.

Occasionally however, a specimen develops with its shell twisted counter-clockwise.

When a rare snail with a counter-clockwise twisted shell tries to mate with a clockwise twisted congener, both snails enter into a slimy foreplay which lasts for weeks.

But the orientation of their sexual organs makes it impossible.

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