There is a silent killer lurking in the French Alps: ski lift cables. Over the last 60 years, the wires have accounted for almost 600 recorded landfowl deaths in the region. Black grouse (Lyrurus tetrix) account for ~70% of the grizzly toll, and that is probably the tip of the iceberg. Figuring out how well the birds see was an urgent priority for wildlife conservationists from the Parc national d