Generalist species: broad niche, live in many different places, eat variety of food, tolerate wide range of environmental conditions
Specialist species: narrow niche, live only one type of habitat, eat one/few type of food, tolerate narrow range of climate, easy to extinct
Native species: normally live and thrive in a particular ecosystem.
Nonnative species
Spread in new, suitable niches
Killer Bee (wild African bee in Brazil)