The flag was adopted October 24, 1964. Green represents agriculture, orange the country's copper, red symbolizes the struggle for freedom, and black represents the people.
The eagle is from the country's official coat of arms.
Zambia Coat of Arms:
Adopted on October 24, 1964, the coat of arms of Zambia is composed of an African Fish Eagle (the eagle of liberty) hovering above a pickaxe and hoe (representative of the country's economic backbone).
Making up the base are a Zambian man and woman supporting a shield depicting the Victoria Falls; a white ribbon displaying the country's motto, "One Zambia, One Nation," completes the design.