A singulation device can singulate items. The items can be received onto a singulation conveyor. A portion of the items can be retained on the singulation conveyor by a retaining ledge. The portion of the items not retained on the singulation conveyor can fall onto a return conveyor. The singulation conveyor can transport the retained items along the length of the ledge. During conveyance, some of the items can fall off of the singulation conveyor onto the return conveyor.