Non-native species, also known as exotic, alien, or introduced species, are defined as species that occur in a certain place due to deliberate, accidental, direct, or indirect human actions. Both animal and plant species are capable of becoming established in the wild when they are brought into an area that meets their living requirements. Many exotic plant species begin as ornamental landscape plantings, while introduced animal species often become established due to humans releasing them outside of their normal range.
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President Franklin D. Roosevelt signed legislation creating Harpers Ferry National Monument on June 29, 1944.