Concept: Outlining animals with subway routes

Looking at the vivid patterns below, do you think they are graffiti by some kid? You're wrong. All 17 pictures below are animal patterns sketched using the London Underground map (really, just animals). Aren't you amazed? I found this picture on Jandan, and my curiosity drove me to keep searching. Eventually, I found AnimalsOnTheUnderground.com, a website that sketches animals using subway maps. The domain name is super long, but its meaning should be pretty easy to understand (Sorry for the poor English translation).