Hello there and welcome to BYC! 
The hours just before dawn and sunset are the killing hours for predators. So be very careful letting birds out in the dark.
Good luck and welcome to our roost!

The hours just before dawn and sunset are the killing hours for predators. So be very careful letting birds out in the dark.
Good luck and welcome to our roost!

But, seriously, we have arial predators who will swoop in on a chicken while you're watching. My little princesses don't peak their noses out until someone turns the lights on in their run.
Best wishes and have lots of fun! 