All I can say is the white giants will be easy to tell. They are dark gray, and should already have tiny little white wing feathers coming in when they arrive. Mine were pretty dark, but not as black as the australorps and black giants I've had. It was really fun to see the white feathers on those dark babies.
I'm jealous and excited for you! I want chickies!
I'm jealous and excited for you! I want chickies!