Non native species - An introduced species to a location that DOES NOT cause harm to an ecosystem or humans., Native species - A species that has evolved or developed naturally in an area over thousands or even millions of years. , Invasive species - An introduced species that causes economic harm, harm to health, and/or to ecosystems., Natural ways species are introduced. - Birds dropping seeds, animals migrating or moving , Ways humans introduce species - Planting things from other areas, moving firewood (insect spread), ballast water from ships, Maine native species - Chickadee, blueberries, rock crabs, red backed salamander, salmon, sweet fern, Maine non native species - Apples, farm animals, crops, Maine invasive species - Green crab, emerald ash borer, oriental bittersweet, asian crab, Why species become invasive. - No natural predators. Reproduce quickly. Adapt easily to environment.,

native and non native species

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