Glossary

Biodiversity
Biodiversity is all life on earth, even that which has yet to be discovered. More specifically, it includes the millions of diverse species, from bacteria to whales, that share the earth's lands and waters with us.

Herbivores
Animals that eat only plants are called herbivores.

Non-native
Organisms are considered non-native (alien, exotic, foreign, introduced, non-indigenous) when they occur artificially in locations beyond their known historical natural ranges.

Parasites
an organism living in, with, or on another organism.

Source:
Alien Plant Invaders of Natural Area http://www.nps.gov/plants/alien/bkgd.htm
Merriam-Webster http://www.merriam-webster.com