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?