The group was visiting Sundance's iron ore project in Cameroon and Congo, the company said.
In Madagascar, the percentage rises to 22 and 15 percent in Angola, Cameroon, Congo and Malawi.
The Dzanga-Ndoki Park, a World Heritage Site, is located in the south-western corner of the Central African Republic (CAR), where it borders Cameroon and the Republic of Congo.
The UN says tens of thousands of people have fled CAR into neighbouring Democratic Republic of Congo and Cameroon.
Most of the refugees have gone to the north of the Democratic Republic of Congo, others to Chad and Cameroon.
BBC: Central Africa Republic crisis: Refugee numbers 'swell'
The following countries have reduced their repetition rates by more than 10 percentage points since 1999: Cameroon, Congo, Ethiopia, Madagascar, Mozambique and Rwanda.
The majority are found in Cameroon, Central African Republic, west Congo, Equatorial Guinea, Gabon and Angola.
CNN: First gorilla genome map offers clues to human evolution
For that, he travelled to the forests of Cameroon, in the heart of the Congo Basin -- indigenous people, wildlife and logging companies all compete for dwindling resources and as Quest discovers, time is running out.
Besides Cameroon, Wolfe's group has projects in China, Malaysia, Congo, Laos and Madagascar.
In addition to Cameroon, Wolfe has teams in the Democratic Republic of Congo, China, Malaysia, Madagascar and Laos.
Several countries have introduced or amended laws to strengthen community land rights - including Angola, Cameroon, the Democratic Republic of Congo, Gambia, Mali, Mozambique, Niger, Sudan and Tanzania.
The new funding will support HIV and AIDS prevention in 14 French-speaking countries in West and Central Africa, namely Benin, Burkina Faso, Cameroon, Central African Republic, Chad, Congo, Democratic Republic of the Congo, Gabon, Guinea, Ivory Coast, Mali, Niger, Senegal, and Togo.
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