One of my ducklings appears very sick. He eats and drinks only when my other duck makes him, and no longer bathes or preens at all (previously his favorite thing). Whenever I pick him up, he does this: He always appears sleepy and is displaying less and less energy/movement every day. He doesn't even cry for my other duck anymore when I take her out of their box and he's alone. I'm very worried. What do I do??? How can I help him? If he dies, my other duckling will absolutely follow shortly after.. She is completely in love with her nest mate.