Since the 1950s, dogs have leapt from the same spot on Scotland’s Overtoun Bridge so consistently — almost always from the right parapet, almost always on clear days — that one behavioural investigation eventually traced it to the scent of mink living in

For decades, dogs have leapt from one spot on Scotland's Overtoun Bridge, earning it a grim nickname. A behavioural investigation points not to the supernatural but to a hidden animal's scent and the…