Ebony was the smallest and lowest duck in the pecking order. She is so passive that she wouldn't hurt a fly. She was with a pair of 3 week old goslings during the storm and she did very well with them. As soon as I put the ducklings in the nursery, she came hobbling over as quick as she could to see what was going on. The ducklings took 1 look at her and started trying to get to her. 1 managed to squeeze through the chicken wire to get to her. So I put her in and all of them settled down.
Ebony doesn't mind them crawling on her back, but she hasn't spread her wings to allow them under her for warmth. I have a 250W heat lamp in there, but it is going to low 50s for next 3 nights. They need to get under her for warmth for the next few nights or come inside.