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ne species, the Cattle Egret, was historically an African bird. In the 20th century this bird colonized North America and is now found throughout the lower 48 states of the United States The Cattle Egret is the only Old World bird to establish itself in North America in historical times without being introduced by man. As such, it is not marked as introduced on this list. Neither is the Glossy Ibis, which probably had a similar history.