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A Plymouth Rock rooster with his flock. The Plymouth Rock, often called simply Rocks or Barred Rocks (after their most popular color), is a chicken breed that originated in the United States. The Plymouth Rock is a dual-purpose, cold-hardy bird and therefore makes a great breed for the small farm or backyard flock owner. These chickens are often called Plymouth Rocks, but this title correctly belongs to the entire breed, not just the Barred variety. There are seven varieties of Plymouth Rock chickens: barred, blue, buff, Columbian, partridge, silver-penciled and white.