reply to post by Gawdzilla
Don't forget natural selection. I fancy I can see that happening on even my own little microsystem -- wild chickens. They produce offspring
that are either yellow or black. The black ones are almost impossible to see in the bush if they hold still and are quiet. The yellow ones stand
out. When a presumed predator approaches, the hens somehow settle the chicks down and they freeze, quietly tucked around their mother.
I see very few of the yellow chicks -- if any -- survive. I believe it is because the wild dogs and feral cats spy them and eat them. It's the
only explanation I can think of, as they all seem to run equally fast.
We're now on our sixth generation (near as I can figure) of wild chickens. They came from a nearby coop in which the owner elected to turn them
loose and range "free". So far this year, I've seen no hens with yellow chicks, except one, and she only had one yellow and six black.