Candle! And no, the flashlight did not hurt them. But, too high of humidity can cause issues which prevent hatching. Candling will let you know if they are alive or not.
Oh, that makes perfect sense now! Yes, this is a sex-linked cross. So, only girls will show buff, but the boys do carry it. It sounds like you have a buff mallard female. Buff would make a girl lighter with brown feet and golden down. The wild-type or mallard would give the duckling that...
It is hard to tell with the lighting in the first pictures and not a full body shot in the second. I also do not understand who you think the parents are. Were the standard buff and the white crested the grandparents? The crested gene is dominant but shows variable expression. Which means a...
I agree with wait and watch. Those new feathers are heavy and she is lacking the strength to keep them up. But, they aren’t turning with angle wing yet. Also make sure she gets lots of exercise (swim time especially). Moving builds muscle.
I stapled/nailed 1” mesh onto cedar fence boards and then screwed those onto posts. It works great since they can’t stick their heads through. Mine is only 3’ high but you could add another board and/or have a skirt of mesh on the bottom.
I find all the different color names fascinating. My duck, Milky Way has one blue from her mom, one black from her mom (necessary for blue or splash), and one sex-linked brown from her Khaki Campbell dad. Here are more pictures:
I would try the B vitamins. I believe you need his weight off those legs so he might need a sling chair. I have seen people use garage sale baby bouncers with holes cut for the ducks legs to go through. In the chair he will need diapers or poi pads. Swimming in water he cannot stand in is...
I am glad you figured out your white ducklings. It’s cool you got some. The white in Pekins is a totally separate trait which prevents pigment in feathers. But, that white bird can be genetically any color underneath. Often they carry color similar to a black Swedish. The gene for white is...
Get a mirror and a stuffed animal for in the brooder.
She is too little to be with the older ducks but you can visit them with her. I used to let mine sit on my lap and watch the others from there. It helps them think that we belong in this flock. My single duckling from two years ago is...
Silvers have dark bills so I do not think these are them. I have read about white ducks hatching with white down. I suspect that is what these are. I do understand your confusion.