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A 69-year-old amateur scientist has apparently discovered that her garden snails have a homing instinct.


 garden home homing instinct snail experiment
Snails with shells that coil anti-clockwise are less likely to fall prey to snakes than their clockwise-coiling cousins, scientists have discovered. The arrangement of the snakes' teeth makes it difficult for the reptiles to grasp these "left-handed" snails. The effect of this advantage on the survival of Satsuma snails is so great, say the researchers, that they could separate into a distinct species.


 snail evolution snake coil direction left-handed protection