I saw a pine marten while riding the Daylight 600 many years ago. It was probably between 4 and 5 a.m. somewhere not long before the Benderloch control (i.e. near Oban). It was running along the road ahead of me, quite unconcerned by my presence, until it disappeared into the forest, so I got a good look. My first thought was "fox!", then "no, cat!", then "I wonder what that was".
Duncan Peat, the controller at Benderloch, identified it as a pine marten and was dead jealous because he'd never seen one.