Deep in a Gabon rainforest the humidity soars, the thick atmosphere choking a breeze barely perceptible in the tree-tops. Elephants live here, and have possibly stood by with invisible stillness as I slip silently through the forest. If I pause long enough, monkeys may stir in the canopy above. Hornbills sail overhead, their hollow primaries churning the air like blades of a helicopter. Cuckoo melodies drift light as feathers from high above, swallowed by armies of crickets hiding below.