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Researchers studied 40 bonobos at the Lola ya Bonobo sanctuary in the Democratic Republic of Congo, and 50 chimpanzees at the Chimfunshi Wildlife Orphanage in Zambia.

Rwanda and the Democratic Republic of Congo have signed an agreement to respect each other's sovereignty and come up with a draft peace deal by 2 May.

The Democratic Republic of Congo and Rwandan-backed M23 rebels have agreed to halt fighting in the east of the country until peace talks mediated by Qatar reach their "conclusion".

Mr Boulos, whose son is married to Trump's daughter, Tiffany, said several US companies had expressed an interest in exploiting minerals in the Democratic Republic of Congo, following his recent trip to the resource-rich central African nation.

For example, he spoke out against what he saw as the plundering of natural resources in places such as the Democratic Republic of Congo, a vast country which is home to Africa's largest Catholic community with almost 55 million believers.