Will Cots go inside at night?

[gilpinguy]

I'm tossing the idea around of building an outside pen for my Coturnix birds for the summer that connects to their cages in a shed. Will the birds have enough sense to go inside their cages at night? I was thinking of having a plank to a door maybe 12" X 12" that leads inside to their cages.

 

[GPBII]

All of my large group cages have indoor/outdoor access. It doesn't matter what the weather is like, they only go inside to lay eggs. Otherwise, they stay outside all night long.