If you’re left-handed you can often find things aren’t so easy for you — but not for some snails! Scientists have found that snails with shells that open on the left have a big advantage in life — predators find it really difficult to to eat them. US scientists studied snails preyed on by the crab Calappa flammea. The crab is unable to open left-handed shells because it only has a tool for peeling them on its right claw making it too tricky, so they leave the snail.

But sadly the left-handed snails find it much harder to find a mate, and so will probably remain rare or die out completely - despite escaping the crabs.