Did you figure out what it was? I have a chick that matches exactly your description. (Much smaller than the rest, picks at others, all black.) I actually had to help this one from the egg, as there was a classroom mishap in the young student wing at our school. Do you have any updated pictures?
When I bought my Pekin ducklings, the store said the were around 5 days old. That puts them at a day shy of 2 weeks. On is getting really good, already, and the wanna-be quack. (I am now questioning how old they really are.
Went to TSC and bought new ducks last night. 2 are Rouens. (Classic markings) The other guy, I am not really sure. He has black and orange feet and the underside of his bill is bright orange. His bib, however is very small and whiteish. He doesn't seen to have the larger yellow area on his...