I was crossing a steep-sided valley in the Vanoise national park in the French Alps by car when something in the sky caught my eye. My brain, unable to process what the huge black raggedy-looking thing could be, jumped to the conclusion it must be a drone, trailing a bin bag, so incomprehensible was its size. But, as it passed overhead, I saw a flash of orange underbelly and realised I was looking at an enormous bird.
