"At one point, the Plymouth Rock Chicken was the most popular breed of chicken in the United States. This chicken breed has been around for more than 150 years."
"The Plymouth Rock chicken was first sighted in 1849 in Boston, Massachusetts USA. But after the initial discovery, they were not seen again for 20 years."
"The Plymouth Rock chicken may have been named after the Plymouth Rock, a monumental piece in the history of Massachusetts and the United States."
"...Plymouth Rock chickens have a decent genetic pool. So, they are not unusually prone to any disease."
"Plymouth Rock chickens are typically very cold-hardy. However, since their combs and wattles are a bit large, they could be susceptible to cold in extreme cases."