Confused about native, non-native, introduced, and invasive species? This guide breaks down the definitions, explains how scientists classify them, and explores real-world examples like zebra mussels ...

That's the number of aquatic non-native species that have made their way into the Great Lakes as of 2023—at least the ones that scientists have identified. About one-third of the species have ...

Native species evolved naturally in a region; non-native species exist in any given area due to human activity. Only a small percentage of introduced species become invasive, meaning they cause ...