According to different sources, collection of medicinal plants growing either in the wild (over 60 plant species) or cultivated in special forestry farms (some 22 species) yields revenue between 2.5 million and 5.6 million somoni per year. However, if immoderate and not effectively controlled, this activity can lead to the extinction of these valuable species (as has happened to at least two rare plant species included in the Red Book). Each year, the Committee on Environmental Protection receives requests submitted by hunting organizations and makes enquiries of the Academy of Sciences for scientific opinion on the number of animals that could possibly be removed without harming the viability of the species population.