Rosie is the boss. I now know the true meaning of "The Pecking Order".
She is the biggest bird by far, and the only one whose comb is erect.
Daisy is in the worst condition. She is smaller, with very little feathering, and Rosie dominates her ruthlessly. However, she is also the bravest about trying new things, and got first, second and tenth dibs on the lettuce leaves.