What is "australorp"

The Australorp is a chicken breed of Australian origin, developed as utility breed with a focus on egg laying. It achieved world wide popularity in the 1920s after the breed broke numerous world records for number of eggs laid and has been a popular breed in the western world since. It is considered the honorary National Chicken Breed of Australia, and The most popular colour of the breed is black, which is the only colour recognised in the United States of America, but blue and white are also recognised in its home country and the Poultry Club South Africa recognises buff, splash, wheaten laced and golden in addition.