I have Western Sierra Foothills Bush Chickens. They don't spend the night there they return to the coop at night. However, during the day, the younger and more bantam-y of the flock perch in the branches of a particular bush. Some others have dug out dusting holes beneath the overhanging branches, and they'll trade off throughout the day.
Either that, or I have a Western Sierra Foothills Chicken Bush that just hadn't "fruited" chickens until I moved there.