The black one looks like a marans to me. I don't think australorps have feathered shanks. The mystery will certainly be solved when she lays, if she's a marans it should be totally obvious from the very first egg. If she is, make sure you use a roo with brown ear tuft feathers on her or you will get a bunch more just like her... just saying... lot of people here don't believe me, but I have a half dozen just like her, hoping to fix it back with coppering next generation...
