Bioko’s drill population shrank by a ... Scientific Reserve at the south end of the island, where villagers aided by the BBPP monitor monkey numbers. Over the past decade BBPP staff have ...

Treading water and barely able to open my eyes in what felt like a constant driving rain, I craned my neck upwards trying to guess the height of the ledge above. I was under a cascade of water ...

Off the coast of Central Africa lies an isolated island ... incognita is called BIOKO. The ruler of this realm is one of the world's least known primate species, the drill.