But let's not get confused, because within that beautiful, complex network of biodiversity, not everything is so simple and easy, and that's what largely brings vitality to science. Because we have realized that what we have called “fat snake” throughout life is not the only one in Euskal Herria. It was a single species, because genetic studies have told us that there are two. While in Hego Euskal Herria there is an Iberian snake with ties, in Iparralde there is a snake northern tie. They seem very similar to each other, but different as genes tell us.

As if it were not enough, the Iberian snake with ties undergoes an adult change from a young man and as it increases, it loses the white back tie. And so over time, it will become a pretty big snake. That many baserritarras think it doesn't look much like the young man. Therefore, in orality, two species have often been considered as young and mature. Like two snakes that live in the same place.

It's known in rural centers. In addition to the openings of the forests, the Iberian snake with ties is also attracted to the meadows surrounding the farmhouses. So, we've often been told they look at cutting the grass. However, in recent times, when machines have occupied the site of harvest, many appear dead, killed by the machine itself. And that, of course, is not good news. Because those of you who know know that it's a snake that has no danger: it's a slow snake. It does nothing. The Iberian snake with a tie has no venom. As many baserritarras have told us, the good snake is not to finish, but to keep it close to the house, as it is a passionate food for mice, rats and small mammals.

In addition to the meadows, you also like wet areas. For this reason, in many places we will find ourselves in the vicinity of streams, in the vicinity of wells or vents. If the frogs or rapes are in front, they will not refuse these snacks and so, well fed, it will get a considerable size. It can reach almost 120 cm.

In the winged snake, science has shown to orality that young people and adults are the same species, and that genetics is the science, the only one we believed, two species. However, researchers will have to continue working to find out what species the tie snakes are located in the Bidasoa area, and to know where the line of separation between them is actually located.

In fact, the simplicity of nature is the one that presents the greatest complexity. As we expand our knowledge about him, in what makes us feel that we know less and less.