"Pop-door" Definition, Please!

[Weasleymum]

I have noticed several coop-builders refer to a 'pop-door'. It seems to just be a chicken-sized door connecting the coop to the run. Is there anything more to it-- like it can open from inside but not from the outside, or something like that? Would a little chicken tractor (that has no human-sized door, obviously) still refer to the chickens' entrance door as a pop-door?

 

[roosmom]

Hi, I think that it would be referred to as the same, a "pop door". I do not think it matters what side the door opens on. But, the "pop door" can be opened from the inside only. It depends on how you want to set it up.

 

[HorseFeathers]

Pop door n the entrance by which chickens can fit and we cannot and therefore must detour into the coop to catch them.

 

[Chirpy]

It's also called a pop-hole. It is just the "little" door that only the chickens can go through. It makes no difference whether it opens from the inside, outside, up or sideways.