Nice shot, great detail. I follow a few web sites and one magazine dedicated to wildlife photography in Finland, and I don't think that kind of detail is possible without using a hideout and spending a few nights in it.
Come on down here u can play with this pair. The female had her webed foot bitten off some time ago. I was sitting in a golf cart. 10 feet away. That far so I could use the 300mm close up. They actually let me closer. I'm de pied piper. Haha