for chick coop

Letting a hen sit on a nest of eggs to hatch them is far easier than using an incubator. The broody hen IS the incubator, turning the eggs and keeping them warm and at the correct humidity level. After the eggs hatch, she acts as the brooder box as well, needing no electricity to keep the chicks warm and safe. No more messy, dusty brooder in your laundry room or garage, no worries about heat lamps.

The mother hen also shows the chicks how to find bugs and which weeds are safe to eat, and she will introduce them to the rest of the flock when she feels it's time. But for this you need  broody hen. So how do you know when a hen is broody and how do you 'make' a hen go broody?