Plymouth Rock chicken (Rocks, Barred Rocks) The Plymouth Rock, often called simply Rocks or Barred Rocks is a chicken breed that originated in the USA. The Plymouth Rock is a dual-purpose, cold-hardy bird and therefore makes a great breed for the small farm or backyard flock owner. The Plymouth Rock was developed in New England in the middle of the 19th century and was first exhibited as a breed in 1849.

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