Men in dusty workwear trudge through a thicket, making their way up a hill where sprawling plantations lay tucked in a Nigerian rainforest whose trees have been hacked away to make room for cocoa bound for places like Europe and the U.S.

Kehinde Kumayon and his assistant clear low bushes that compete for sunlight with their cocoa trees, which have replaced the lush and dense natural foliage. The farmers swing their machetes, careful to avoid the ripening yellow pods containing beans that will help create chocolate, the treat shoppers are snapping up for Christmas.

Over the course of two visits and several days, The Associated Press repeatedly documented farmers harvesting cocoa beans where that work is banned in conservation areas of Omo Forest Reserve, a protected tropical rainforest 135 kilometers (84 miles) northeast of the coastal city of Lagos in southwestern Nigeria.