Good luck with the hatch! I came upon a few Bielefelder eggs by chance when buying Marans. Of the 14 I hatched we're keeping 3 Wheaten Marans (pullets I think), and 3 Bielefelders (1 Roo and 2 Pullets), So far, at 3 weeks the Bielefelders are super mellow and the roo will even approach my big girls, 4 Buff Oprppingtons although they don't want anything to do with the "kids". Here's pics of the three at 2 weeks. If any Bielefelder experts are out there please comment on the faded "eyeliner" on the blue background pic, should I be concerned?
I can't wait to see them grown! They are developing vivid colors at 3 weeks.
The bottom two might be roos. Light spot on top of the head of the upper blue photo, and hardly any stripe down the back on the The lower photo. But I'm not an expert! They sure are cute!