In the distant past, it was said that a squirrel could cross Spain from one end to the other without leaving the trees, to indicate that it was extremely wooded. The snake, although abundant in our mountains, is also something to take into account, because some species are extremely dangerous, although they cannot be compared with the terrible snakes of other places, such as cobras or horned vipers of the deserts. And of course, there is a whole symbolic world behind them.