It's good...

... to have a thrush in the garden. There are broken snail shells all over the patio. We get more damage from snails than slugs most of the time (they collect in the tight Kniphofia leaves to aestivate). Nematodes don't target the snails, so a friendly spotty helping beak is a relief.
Incidentally, I do like the word 'operculum' - the name for the the door to the snail's shell.