There are Animals on the Underground. That is, you can see animals in the lines of London Underground maps:
The Animals, made up using tube lines, stations and junctions on the London Underground map, were spotted by Paul Middlewick some 17 years ago.The original Animal, the Elephant, was discoverd while Paul was staring at the tube map during his daily journey to work.
Since then, the Elephant has been joined by many other Animal friends.
Take a look.