Sporcle Quiz: IUCN Categories

Every month, I try to publish one species fact profile (I used to do several per month before I realized that I was just being lazy and not trying to come up with more original material).  Each features, at the top, basic information for the species described, including its conservation status.  This is generally expressed through the classification of the species under two entities - CITES and the IUCN.

CITES - the Convention on International Trade in Endangered Species - is an international treaty which regulates the trade of wildlife around the world.  The IUCN is the International Union for the Conservation of Nature, devoted, in its own words, to finding "pragmatic solutions to our most pressing environment and development challenges."  It might be best known for its production of "The Red List", the authoritative, scientific attempt to classify the conservation status of every species on earth on a scale for "Extinct" to "Least Concern."

There, I just gave you two of the answers.  Can you name the other categories of classification?