Disadvantages
Gorillas lose their natural shyness toward people: as a result they raid crops and no longer flee from poachers.
Infectious diseases: diseases can be transferred from humans and domestic animals to gorillas.
Behavioural changes: the presence of humans may generate stress.
Population pressure: an increasing number of people hope to profit from tourism and therefore move closer to the protected areas. People living in the neighbourhood of the gorillas but making little or no profit from tourism are often frustrated and, as a consequence, they may hinder protection measures.
Habituation of too many gorillas: the range countries may become too dependent on gorilla tourism and habituate more and more gorilla groups.
Within national parks habitat is lost for tourist facilities and vegetation is destroyed.