What birds/colors are feather sexable at an early age?

[SarahLadd]

I had no idea that my quail Belgian bearded d'anvers could have been definitively feather sexed by three weeks of age. I know salmon faverolles are also mostly sexable by about 3 weeks, too.

Besides autosexing breeds, what colors produce "dead giveaways" by 3 weeks of feather development? Also, am I correct in assuming that a lavender quail d'anvers would also be sexable by 3 weeks?

I'm going to try hatching eggs and if my yield ends up the average I should have at least 7 babies to raise in a cornucopia of color varieties.

 

[Artichoke Lover]

My Barred rocks have always been easy to tell at that age. Much easier than trying to guess headspots to me.

 

[FeatherTay]

I can tell *most* single comb breeds by 4 weeks. 3 weeks is a bit iffy.