One of my older hens who has never hatched a chick in her life, decided to brood a small nest of abandoned duck eggs. She hatched one egg successfully. I think the others were stolen by a snake or crows. At first she ignored the wet, newborn chick, and even attcked it. I found it wet and weak on the grass a few mornings ago, brought it in, placed it under a warm light bulb, and later in the day, after it was dry, fluffy, and moving with some energy, I placed it back in the empty nest, which the hen was still "brooding". I gently pushed the duck chick under her. She didn't object, so I left the duckling there. I stood by and watched. She began to poke around under herself, and then accepted the duckling. It has been 3 days now, and the pair are doing fine. She is an extremely attentive mother. Everything looks fine- there is food and water close by, and shelter of course. Is there anything I should be aware of? Thanks