In the small cliffs, take the time to watch… and with a bit of luck and mostly patience, you will see a small grey bird the size of a nuthatch climbing. When it spreads its wings, you’ll see a glimpse of red. There is no doubt about it: this is the wallcreeper (Tichodroma muraria), also called the “butterfly bird”. Its long, curved beak allows it to delve into every little fissure in search of the insects it feeds on.