The Shell of the Snail

Isn't it too heavy to carry the shell to climb the plant?
"Yes.  How I wish I could discard the bloody shell!  Say the snail, "then, I will be able to move around freely and speedily! Better survival!"

Without protection, the species snail, will be wiped off within a short time. 
Individual thinking cannot match with the million years of evolution. 

The shell also looks like a python, that will scare off many other predators!