Just to be clear, we’re not talking radical politics here, but about a one-in-a-million genetic mutation that causes the shell of a garden snail to coil anticlockwise instead of clockwise or, in other words, left rather than right. These so-called ‘lefty’ snails not only stand out on looks among the hoi polloi of garden snails, but can also only mate with another of their own kind, making theirs a lonely existence. And, by the way, their offspring isn't lefty!

More information:

wired.co.uk/snail-jeremy-left-handed-love