I've been posting barred mottled extended black chick and juvenile pics for the last 2 years or so.To be honest, that's kind of why I'm wondering why the Ancobar is often mentioned as autosexing. I have had had BR lines that were as easy to sex at hatch as my lt brown leghorns or anything crele, but it's DEFINITELY something that has to be selected for.
With the down patterns of mottled birds, it seems like it would make it impossible... not easier.
I have not been able to locate chick pictures of extended black barred+mottled at all.
I noticed @The Moonshiner has blue barred+mottled though. What say you, sexable at hatch?