A good friend of Kreuzberg and a favorite artist of mine. His work is omnipresent in Berlin. Here's a good summary in video format of what his work is like... I didn't notice any owls though, and his owls are among my favorite tags.
4rtist.com from klitorik* on Vimeo.
Here's an older one
http://www.flickr.com/photos/streetart/2400361881#.%EF%B4%BE%CD%A1%E0%B9%8F%CC%AF%CD%A1%E0%B9%8F%EF%B4%BF