I feel the same way. I had my Dumplin for 10.5 years, and nothing could get to her... Or so I thought. I had wire mesh dug into the ground 2 ft down all the way around and steel grid tiles on the top tied together with steel cable. Then the back covered with double layer aluminum, all held together with 3" screws into 4x4. I was not going to have anything get to her. Then I came out one day and the steel grid tiles were torn apart from the 4x4. My poor Dumplin was gone, just so something could take her eggs 

 Now, my Dandy Lion is a strictly inside duck. I can't go through that again.