Large fowl Cochin colors, what do I have here?

[Mariella posey]

This little one hatched last night and I thought it was just a black Cochin. Well now I see it has brown down feather.
My hen colors are Buff, black, barred, and one partridge that I'm not even sure is partridge.
I have 1 buff rooster and 2 lemon-blue roosters.
All of the Partridge chicks that have hatched before were just black with brown head, and they feathered out like the hen in the picture.

 

[M-H-Fielding]

Hmm, hard one. Your chick looks adorable, though!