These seem build wise before legs got bad, as more runner looking as two stand and run straight as a pole, downturned sloping beaks and long thin bodies. so went by runner standards of keeping in that they'd need a lot more room, sun, greens, and bugs,than chicks n other ducks to get enough muscle strength to support their unique stature ect, as mine run and don't waddle. i figured how to stop mine from being skiddish.. just whistle chirp or quack a certain way when feed/treat them, as after second time doing to now i have to knock them over to do anythin in brooder, and they constantly are playing all over under and around me when I'm trying to clean ect (not to forget to mention them trying to swallow my fingers and eat my hand sleeve ect). I bribed them with dandilion greens, so either that was key as well as bff bribeing with lettuce, or just that they got over being terrified quick, or got good strain (i have to push them to get to move out of way. the whisting when feed works with all pets, especially birds allowed free flight outside, especially when fed when whistle ect at dusk ect, before let loose (used to do with rescued parrots ect to get them exercise).
