The initial ceasefire was agreed by two rival generals deep in the forest in March.

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When the wardens feel that that an orangutan is fully rehabilitated, it is caught and then returned to the wild - usually deep in the forest or to one of Sarawak's National Parks or Wildlife Sanctuaries.

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Plans to regenerate a former deep mine in the Forest of Dean have been given the go-ahead, but with conditions.

BBC: Forest of Dean Northern Quarter regeneration approved

Even under deep forest cover in the California redwoods, the offline navigator managed to get a GPS lock within a few seconds.

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Heatley, the ecologist, said that "not one" of the energy companies drilling in the area has a long-term restoration plan for sensitive deep-forest environments, and that permits usually require only minimal restoration, such as planting grasses.

WSJ: Northeast drilling boom threatens forest wildlife

To see crows, opossums and squirrels, "you can go anywhere, " he said, and in the Northeast it's easy to find trees, but large blocks of deep forest are rare.

WSJ: Northeast drilling boom threatens forest wildlife