I believe it is preening at times, especially when they are sitting on my lap. I notice that they pull bits of weeds/hay out of my hair or off of my clothes if I have been doing yard work, etc. They will casually reach out to pick at a piece or two and then settle in to rest. They are grooming me, just like they groom each other when they are relaxed. Since they have food and water available at all times and free range during the day, they aren't looking for food when they jump up on my lap, they are looking for companionship. This behavior is different from when they are pecking for food or demanding attention.