Follow it as far as the turning where the path to Font de la Ruta is marked. The beginning of the trail is dominated by hazels and raspberry bushes. The path climbs and Scotch pines start to dominate the woody plants. They can be recognised by their orange-hued trunks. Some of them have very thick trunks, showing that this is a fairly mature forest. Also growing here are sallows or goat willows and birches. A few metres further up is the Ruta spring, in a turning on the right. This is a very wet area, densely vegetated, with aspens (trémol in Catalan refers to the leaves shaking in the wind) and some specimens of white beam, mountain ash and fir. The aspen is one of the trees where the black woodpecker nests. It makes an oval hole, unlike the great spotted woodpecker, which makes a round one. Continue along the trail and at the next junction, turn right to reach Comella Parc estate along the Cortal de l’Estevet path. On this path, foxes’ droppings indicate the presence of this handsome carnivore. Among the branches of the pines are small birds looking for food, such as the coal tit or crossbill. The latter has a crossed beak for extracting the seeds from pine cones. Once on the track, carry on to the left, leaving the green hedge and estate behind, to the Cuc channel. Raspberries, willow herb and mullein appear. This is a stony area and just between the stones grows Antirrhinum asarina, an interesting species as it is endemic to the Pyrenees. From here, on the left, the Bosc Negre path starts. Follow it to a turning on the right, which takes you back to the track and the Bosc Negre spring, where there is a viewpoint over the valley. The path returns by the track to regain the Cuc channel. To the left, you walk down the Trapella pass path, surrounded by much wetland vegetation. You reach Cuc spring and Ferro spring. A few metres on, you come back on to the track which leads to Comella Parc estate and the picnic site.