 Additionally, the drill's response to distress calls of duikers may be indicative of their willingness to consume them.The Bioko drill is considered endangered, and is highly threatened by the bushmeat trade.Primates such as the drill that have larger bodies, are slower growing, and are mainly terrestrial, are considered to be disproportionately affected by hunting, and as of 2009, it was predicted that the drill population on Bioko Island was around 4,000.