My one white egg layer is a Blue Andalusian. She's definitely the boss of my little flock and has no problem pushing the other girls around even though they outweigh her by 2 - 3 lbs already.
Those Mediterranean Class chickens are pretty tough for some of them being lighter-weight breeds (Ancona, Andalusian [once known as Blue Minorca], Sicilian Buttercup, Castilians [many of which aren't found in the USA], Catalana del Prat, Leghorn, Minorca, and White Faced Black Spanish). Aren't the "Blue" chicken varieties absolutely breathtaking? Here's our "Blue Ameraucana" and "Blue Breda" girls:
Blue Ameraucanas are so full and fluffy
The Blue Breda have no comb but have stunning blue feathering
A Blue Breda at 7 months - they have feathered feet, vulture hocks, and no comb - pesty friendly quirky little girls