According to a census population in 2011 there was at least 400 mountain gorillas as opposed to 302 in 2006.
That brings the total number of mountain gorillas in Africa to 880.
The figure is hopeful for Defenders of Wildlife who are trying to save this endangered species.
Uganda is home to nearly half of wild mountain gorillas, the rest split between the Democratic Republic of Congo and Rwanda.
According to Gorilla Doctors, the growth in gorilla population is due in part to measures of "extra protection" from the daily supervision of rangers.
Mountain gorillas are an important source of tourism revenue for the Ugandan government.
The Canadian Press