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Because my Buff pullet is carrying Dun, and my cockerel is carrying Khaki. I get 50/50 out of that, and the khakis are born lighter.
How do I know this? Buff colored chickens theoretically have the dun gene, not all, but most. . . Well, when I bought my boy, he had some weird khaki color in his tail, so I thought hey, perhaps that's it? Then people started going on about how some of their Buffs are spitting out black/orange mottled chicks, which made sense. . . It's the black coming out of dun x dun. And then, finally, my theory was confirmed when my Buff hen's first eggs hatched, and were mutts - but about half of them were chocolatey champagne like in color. Thus, she's got one copy of the dun gene, and that passed on to 50% of the mutt offspring. They had no black, instead the black was the weird color, and they had the typical gold leakage as well from crossing to a solid black bird. The others were typical black and gold.
The dun gene is what helps hide any black in a Buff bird, at least, in Buff Ameraucanas. I can't say that for other breeds though, as I've no clue or experience.