A hunter hauls a dead monkey on his back on a road in northern Republic of the Congo.

The expansion of logging roads in the region is closely linked with an increase in the bush-meat trade.

"Most industrial logging takes place in areas with low population density," said Nadine LaPorte, who led a recent study into logging in central Africa. "Logging roads open access to these remote forests."

LaPorte pointed out that logging companies have been forced to clamp down on the bush-meat business. But the logging operations themselves also create new markets for the meat.

"Logging company employees have money, and they like meat," she said.

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