To start off, yes I know if this is true it would be one in a million. Which is why I'm skeptical about it to start off with. But, logistics of it aside, my instinct is telling me that's what I've got. My workplace got in 35 Golden Laced Wyandotte chicks shipped in a few days ago. They originated from Belt Hatchery, which as anyone who has ordered from them knows, has a relatively limited selection. I came into work the day after they arrived to find this little oddity among them. She's definitely a Wyandotte - Aside from the white, she's got an obvious Golden Laced pattern, yellow legs, and a beautiful little rose comb. But the white is coming in all over her body and her wing feathers in the distinct pattern of a mottled bird's chick down! It's incredibly unlikely, but my current thoughts are that somehow, some time, the mottled gene got into this particular line of Wyandottes, and somewhere far down the generations a couple of carriers were bred and out comes this little thing.