Left handed shells

It seems being left handed isn't always a drawback.

Snails with left-handed shells can have a big advantage in life - predators may find it impossible to eat them.

Scientists from the US examined whelks and cone shells preyed on by the crab Calappa flammea.

They found the crab is unable to open left-handed shells because it only has a tool for peeling them on its right claw; so it discards them.

"The crabs have a special tool on their claw, a tooth that's used like a can-opener," said Gregory Dietl from Yale University.

"So, if you imagine trying to use a right-handed can-opener with your left hand - it's very hard to do," he told the BBC News website.

*Ahem* Notice the last quote. I guess that is why this left hander uses a right handed can opener with his right hand and not his left. Do they even make left-handed can openers?!

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