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 ...

Roughly 20 miles off the coast of west Africa sits a volcanic relic now completely blanketed in equatorial rainforest the island of Bioko Its home to some very rare species including the drill one ...

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.