Waarom klimmen slakken, en soms zo hoog?

The question ‘Why do snails climb up?’ is a simple one, but the answer may be complex. Most answers found in resources refer to aestivation, the surmised behaviour of snails to escape from heated soil and to catch a cooling breeze. But if it were just for that reason, why would some species of snails climb meters high? Obviously, snails may climb for more reasons than just aestivation, e.g. to eat fresh leaves or to graze epiphytes from the bark of trees, old walls or the leaves of plants. Other reasons may be to warm up, to prevent drowning, to prepare for coping, or to avoid ground-dwelling predators. The latter reason could explain why snails climb that high: a badger or a fox standing up against a tree might easily reach up to one meter. And a final question is how snails that climbed high return to earth: do they just let go and drop?