This is not one I would have thought of. Presumably with the right type of Kevlar-polythene suit, one could do this oneself.
You just need to find one of those big birds.
Ella Davies, BBC News, 11 July 2011 (Hat tip: NC)
Researchers found that 15% of the snails eaten survived digestion and were found alive in the birds' droppings.
This evidence suggests that bird predation could be a key factor in how snail populations spread.