Urban Wildlife: The Old Street Mouse
Anyone taking the tube at Old Street in the direction of Edgeware/High Barnet will be familiar with this little creature that lives under the red door near the end of the platform.
The Boss says they must be multiples but I believe in one uber-cute Super-Mouse, safeguarding us from leftover crumbs (and future tube strikes. TFL staff, be warned, she'll nibble your toes and lunch sandwiches!).
(The only reason I managed to get this close - shot with a 60mm - is that she was having evening dinner when I took this shot)