Our pekin duck, Lilly, has been acting lethargic the past 24 hours or so and has been holding her head and neck toward the side. She has been drinking normally but eating sparingly, including her mealworms. We went out for dinner tonight with her in her pool and came back to her in front of her run but with an oddly shaped egg left in the pool. Any ideas as to what could be going on? It was as if the egg had a 2-3 inch long tail to it and a button on the other end.