How to Make a Sliding, Self-Locking, and Predator-Proof Chicken Coop Door (2020)

https://www.backyardchickens.com/articles/how-to-make-a-sliding-self-locking-and-predator-proof-chicken-coop-door.75906/

How To Make a Sliding, Self-Locking, and Predator-Proof Chicken Coop Door

This article is here to help you make your very own DIY vertical sliding, self-locking, and predator-proof chicken coop door. Simple and effective coop door that any experience level can build easily. Easy list to reference and affordable tools...

BackYard Chickens - Learn How to Raise Chickens
what's the chickenwire tunnel at the front door for? only thing i can think of is it lets the chickens see if there's a bird of prey above? but I don't know if that's something chickens are checking. or keeps certain large predators from fiddling with the door (but not large like a bear), but doesn't seem the door should open anyway