With only 650 mountain gorillas currently in existence, numbers have not been so low since Dian Fossey highlighted their plight in the 1970s and 80s.
Journeying to Rwanda and Congo, where mass slaughter of the animals has taken place, Donal Macintyre aims to trace a group of poachers. His main focus, the whereabouts of an abducted infant gorilla christened "Baby BBC".
Hunting the hunters: page 25