He and his colleagues developed an iPad app enabling users to create their own jungle music, syncing the sounds of howling monkeys, frogs, rain, fish and streams into a rhythmic symphony, free for children and potential adult visitors to download as a window into Costa Rica's biodiversity.
Finally, our train heaves out of the station and past the creeks of Mombasa Island, belching out plumes of thick smoke as we swoop around shanty towns where corrugated iron roofs glisten in the rain, and ditches where frogs croak in the darkness.