Acquired Immune Deficiency Syndrome Virus A viral disease spread by contact of bodily fluids. The virus attacks the immune system and leaves the infected person susceptible to other diseases.
annual per capita income The average income earned per person in one year.
blackbacks A male mountain gorilla between the ages of six and ten that still has uniformly black hair coloring.
Dian Fossey Gorilla researcher who wrote the book Gorillas in the Mist.
ecotourism Tourism that provides revenues for biological conservation or community development.
GDP Gross domestic product. The gross national product excluding payments on foreign investments.
GIS Geographical information system. A collection of different digitized data sets that are related to the same geographic location.
Gorilla gorilla beringei A gorilla subspecies. This is the scientific name (genus and species) of the mountain gorillas.
GNP Gross national product. The total value of products or services produced by a country.
Idi Amin Dada Former dictator of Uganda (from 1971 to 1979).
population density The number of people in a given area. It is usually expressed as people per square kilometer. For example, suppose 100,000 people live in an area that is a rectangle of 10 km by 50 km. The area of the rectangle is 10 times 50, or 500 km2. The population density is 100,000 divided by 500, or 200 people per square kilometers.
pyrethrun A natural insecticide. This is one of the cash crops grown in Rwanda.
silverback A mature male mountain gorilla that has a patch of gray- or silver-colored hair on its back.
watershed An area of drainage that feeds into a stream system. For example, the Wheeling Creek watershed is the land area whose water can drain into Wheeling Creek (see the Water Quality module).
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