N.N. (mouse over)(on the subway tracks)

When I come back home after an evening out, I eventually end up on the platform of the Subway Nb 9 at the Zoo. Between 10 and 11 P.M., I always expect people to be as half asleep as I am, but there usually is so much activity that you might think it is 5 P.M. So I head to the front of the platform and check the tracks for mice. In the summer, there usually are 3 or 4 dancing around. I only saw one yesterday evening, one lonely mouse carefully checking each and every bit of the track....