Not all exotics are invasive!

Exotic: An exotic organism is one that has been transported from its known historical range to a new environment.  The word "exotic" literally means "from outside."  Exotics can also be referred to as alien, introduced, or non-native.

Invasive: Occasionally, exotic species are so well-suited to their new environments that they begin to reproduce very rapidly, threatening the local ecology.  They are then said to be invasive.

Official U.S. definitions regarding exotic invasive species were provided in [DEAD LINK ] Executive Order 13112:

An "invasive species" is defined as a species that is
  1. non-native (or alien) to the ecosystem under consideration; and,
  2. whose introduction causes or is likely to cause economic or environmental harm, or harm to human health.
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