I WOULD LIKE SOME INPUT ON WHAT WE CAN USE ON OUR SWAN FEEDER POLE THAT EXTENDS INTO OUR LAKE. WE HAVE SOLVED THE RACOON INVASION BY TAPING THE TOP, BUT NOW, I BELIEVE A MUSKRAT IS ENTERING THRU THE FEEDER PART AT THE BOTTOM. WE ARE USING A DOG FEEDER WHICH DISPENSES THE GRAIN AND IT HAS WORKED WELL UNTIL THE HUNGRY ONE HAS FOUND A WAY TO STEAL THE GRAIN. IS THERE ANY SOLUTION THAT IS ENVIORMENTALLY SAFE TO APPLY TO THE POLE, SO HOPEFULLY HE CAN'T GAIN ENTRANCE TO OUR SWANS FOOD? HOPE YOU HAVE AN ANSWER FOR ME.tHANKS