Roa is a Belgian street artist famous around the world for his animal graffiti. There's even an entire Flickr group of thousands of images dedicated to documenting his work. This past December, he killed a football field worth of wall at Biscayne and 37th St for Primary Flight 2010.
You gotta see it in real life to really appreciate all the scale of the rodents and dinosaurs. There's an empty field you can park your car, bike, or ass on, sit back, smoke one, and enjoy the scenery. Here are a few pics that don't do the work justice, so if you're in the Midtown area, do yourself a favor and check it out.