Cattle egrets originated from Africa, arriving in South America in the late 19th century before spreading through most of the continental United States in the 1940s.
They were first introduced to the Hawaiian Islands in 1959 by the Board of Agriculture and Forestry, in conjunction with local cattle ranchers. The birds were an attempt to try and combat the plague of flies that were affecting cattle herds. The flies were responsible for causing lower than usual weight gain in cattle, as well as causing damage to their hides.[1]