Why ? .

Why do snails climb all the way up stems of plants when all the food they could ever want is growing underneath them ?. Any ideas ?.
Thank you all for your very kind comments, stars and hearts for yesterdays Dragon Fly, In am always taken aback by how generous you all are with your time. I do feel bad that I don't respond as much as I should. Hope you all have a great weekend and don't get too wet.