I have two two-week-old ducklings, a Pekin and a Buff. They both appear to be very healthy and active - good appetites, eyes clear, etc. The Pekin has lost about half of her down on her little wings and has sparse down on the back of her neck. The Buff has lost a tiny bit of down on her wings. Is this normal? They're inside the house, in a sheep trough with a heat lamp, hay/straw for bedding and eating waterfowl crumble with chopped egg and lettuce as a treat every day. Also getting vitamins and electrolytes in their water. My chickens all went through a gawky phase when getting their feathers but I've never raised ducklings before. It seems odd that she'd have such naked wings. Thanks!