Probably the greatest threat to the great apes is habitat destruction and poaching. Strict regulations and protective measures are intended to minimise this danger and have helped to increase the number of mountain gorillas known worldwide in recent years. Per day, tourist groups of a maximum of 8 people can spend one hour with a mountain gorilla group accustomed to humans, with a special permit. This permit currently costs around USD 600 in Uganda. Because the income also flows into nature conservation and the payment of gamekeepers, this form of tourism is a valuable contribution to species conservation.