The first photo is how I found it, the second, how it should be. I noticed that the bottle wasn’t hanging as low as it should. The second is how it should be. The Magpies had pulled up the string and looped it around the post, which isn’t a trivial job, in order to get it up and stop it swinging so that it would be easier to get to the other side and get the seeds out (which aren’t really suitable for Magpies, but they never stop trying). When I first put it out, they tried to undo the knot and get it off the hook, so they decided on this as a plan B. I am impressed.