Yeah, the chickens at first will be confused as its a new food source they are not familiar with. They have been eating them all long but its after they fall out of the tree and the chicken comes across them on the ground.
Presenting the chicken with the nest is new so they are unsure at first. But once you open it up for them and the worms come out...OH YEAH! DINNER!
I guess I shouldn't be too surprised, my chicks will eat literally anything.