Home to a colony of rescued drill monkeys and chimpanzees, the Drill Ranch is home to Pandrillus, one of Africa's most progressive primate-conservation bodies, which places emphasis on local education to combat poaching and the bushmeat trade. Spending time with Liza, Peter and Tunje at the Calabar headquarters is fascinating. The organisation can arrange trips to the its excellent Afi Mountain Drill Ranch near Cross River National Park. This is one of Nigeria's highlights, with a rainforest-canopy walk and close primate encounters.