The team push further into the jungle wilderness, searching for unusual and endangered animals that live there. Base camp is invaded by scorpions and poisonous centipedes, and Gordon Buchanan discovers an animal thief helping itself to base camp supplies. Steve Backshall finds giant piranha and the long-fanged sabretoothed fish in his river survey, whilst George McGavin catches the world's largest tarantula. The climbing team begin their attempt to scale a huge unclimbed mountain at the forest's edge.
