Cal. Food & Agric. Code § 27635

It is unlawful for any person to sell or represent as chicken eggs, eggs from any other species of fowl, or mixed eggs from more than one species of fowl, or eggs from ducks, turkeys, geese, or any species of fowl other than chickens, unless the containers and subcontainers of the eggs are marked with, or a sign, placard, or other inscription otherwise indicates fully, the species of fowl from which the eggs were produced.