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Description
The Sardona Tectonic Arena offers an outstanding panorama in the Graubünden Alps. Among ornithologists, the Cassonsgrat (Fil de Cassons) owes its claim to fame to the yearly return of a rare migratory bird: the Boltit regularly stops here on its journey from its northern breeding grounds. Breeding attempts have also been noted, but the species can only be reliably observed during autumn migration to the south. While the first birds arrive as early as mid-August, the best time to observe them is from the end of August to mid-September. The birds are not very shy. However, you should never approach them. They usually come to you on their own, sometimes within a few metres of the observer.
During this period, other migrants also occasionally cross the ridge, such as Sivhauk and Vepsevåk. Enghauk, Jordugle, Markpiplerke, and Lappiplerke have also been observed, but only very rarely. A look at the sky is usually worthwhile: Vandrefalk, Kongeørn and, sparsely, Lammegribb can be seen. The picture is completed by local birds such as Fjellrype, Alpejernspurv, Murkryper, Fjellspurv, and Sitronirisk.
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Access
The departure point for reaching the Cassonsgrat is Flims. A new gondola lift is currently being built there, which will provide direct access (although at a ridiculous pricepoint) to the Cassonsgrat from summer 2025 (not yet finished as of September 25, see link below). It is to be hoped that appropriate visitor management will preserve the value of the natural area. Until the new gondola lift opens, the Segneshütte offers a good starting point for a hike into the area.