Modern-day right-handed crabs orient their prey with the shell pointing away from their body and the opening on the right-hand side .

如今右撇子的螃蟹懂得调整猎物---让蜗牛的壳尖远离自己的身体而让蜗壳口对着自己的右边。

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This allows the crab to insert a large toothlike appendage on its right-hand claw into the opening, thus cracking the snail's shell.

ECONOMIST: Why some snails are left-handed

Modern-day right-handed crabs orient their prey with the shell pointing away from their body and the opening on the right-hand side.

ECONOMIST: Why some snails are left-handed