The snails aren't dead yet. They retract farther into thier shell when disturbed, poked etc. If they are picked up and put up onto the rockwork, they move a bit, get to an edge and fall off.
Unfortunatly, that is the best picture i can get with my camera. Im not all that good with photography and I don't have a macro lens. The pic was taken with a nikon d50 with 18-55mm lens.
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