I don't have a fortress but I do have a few coops and chickens houses that have never had any predators get in. I give 110% credit to my 24/ security guard below.
Security guard. Sleeps during the day and works at night. Works for food.Currently guarding 2 roosters (back view) from freezer camp.
Here are a few pics of some of my coops/chickens houses and aviaries. Raised coops, boards at bottoms and plenty chicken wire, hardware cloth and closing and locking coop doors at night.

Security guard. Sleeps during the day and works at night. Works for food.Currently guarding 2 roosters (back view) from freezer camp.


Here are a few pics of some of my coops/chickens houses and aviaries. Raised coops, boards at bottoms and plenty chicken wire, hardware cloth and closing and locking coop doors at night.






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