Traveling to the South Atlantic is quite problematic for a very pedestrian snail.

One day a snail was going along a garden path on a sunny day ,when he suddenly heard a voice from this stone saying to him.Oh this sun snail it has dried me up and i am very warm .Snail said slowly i am cool, stone said how is that then. Simple i go into my shell to cool down.Oh said stone i thought you would have been warm aswell.NO MATTER WHO YOU ARE NEVER JUDGE SOME ONE ON THE WAY THEY ARE, STONE DID!Gary F Evans...

I am fevered with the sunset, I am fretful with the bay, For the wander-thirst is on me And my soul is in Cathay.

One of the species on the Azores returned to Europe. It seems that having got there in the first instance a very long time ago, it relatively recently migrated back to Europe.

Land snails, which we normally think of as being rather slow moving, can actually disperse enormous distances by hitching rides on birds.

Trying to get one of those birds and the snails together is problematic. So I suspect that some type of wading bird, with a cargo of stowaway snails tucked into its feathers, was blown off course by a storm and deposited the snails on these islands.