1. Native vs. Non-Native Species
European Red Squirrel in Europe
North American Grey Squirrel in Europe

2. Native species: An animal or plant that have developed, occurs naturally, and have existed for many years in an area
Coyote
Mountain lion
Sequoia Tree

3. Non- Native species: An introduced plant or animal living outside its native region, which have arrived by human activity, either deliberate or accidental. They have NO natural predators allowing them to cause significant damage
Black Rat- spread across the world
American Bison- to Santa Catalina Island
Zebra Mussel- Great Lakes and San Francisco Bay

4. Invasive species: Is a non-native species that negatively affects its environment
Zebra Mussel in the Great Lakes
Burmese Python in the Florida Everglades

5. Zebra mussels on a crayfish

6. Extinction: A species goes extinct when the last living member dies
Extinction: A species goes extinct when the last living member dies. It is estimated that 99.9% of all species that ever lived are extinct.