Snail High Rise

If anyone knows why 7 snails climbed up the thistle in our yard over the past few days, please tell me. This beautiful specimen is exactly 4 feet off the ground. In addition to why, is the question of how they manage to get up there without benefit snail doctors with little snail syringes of antitetanus serum? Smaller than the snails - about the size of a dime or penny, are the two little fungi fruiting below.