>
> I don't think that could be correct that chicken are not natural
> graineaters. What else would they use their gizzard for if not crushing
the
> grains/seeds? There must have been an enormous amount of different seeds
> lying about in the jungle for ground living chicken to eat and the gizzard
> cannot have been developed lately.



seeds are not the same thing than grains . grains is a seed  from the grass
familly and grow in open spaces not in the jungle where jungle fowl is from
so some grains may be but certainly not a grain based diet .not all seeds
are starchy a lot contain fats .
jean-claude