My ducklings are 2 weeks old today. I have noticed tat they will lay down and use their bill to sift through the shavi gs looking for spilled food. When they want to move most of them will kind of army crawl over to where they want to be. Sometimes even song their wings like arms. If I goto the end of the brooder and talk to them they all come running to say hi so it doesn't appear as though they are having any trouble walking or running. Are they just being lazy?