The last chick is obvious not a d'uccle as it does not have feathers on it's feet. I'm leaning toward Japanese bantam.
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x2Quote:
Sebright are clean legger, smooth faced, and have a rose comb. D'Uccles are feather legged, have a beard/muff, and have a single comb. They are very easy to tell apart from one another.
The third chick (black) already has the jaunty tail and low wing carriage of the Japanese. I can't tell what kind of comb the dark one with the yellow head has but it doesn't appear to have a beard/muffs so we can rule out D'Anvers. I'd like to see a good profile shot of the lightest colored one to get a better idea of the stance and see the leg color.