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I love how the robin can fluff itself up to keep warm in the snow. I always thought that they migrated south in the winter, but when we lived in northern Utah, I saw these hardy birds throughout the winter, surviving on the leftover berries on trees and shrubs. I used my Pitt Brush Pens in shades of grey, and one in iron oxide. These pens are more expensive than I would like, but the quality makes them worth it.