Deep in the rainforest of Central Africa lies an elephant oasis - a remarkable place that holds the key to the future for forest elephants. Over the last 20 years, Andrea Turkalo has been studying these enigmatic giants, getting to know over 4,000 intimately. She has begun to unravel the secrets of their complex social lives and the meanings of their unique vocalisations. New acoustic research is shedding light on the many mysteries that still surround forest elephant society. Will these endangered elephants finally speak out and tell Andrea what it is they need to survive?
Formed from the remains of a 2.5 million-year-old imploded volcano, the Ngorongoro crater is a study in contradictions: On one hand, it's a self-sustained and plentiful land that provides for the many animals that call it home. Conversely, its isolation threatens the existence of many of its key species. What does the future hold for this unique habitat?
The team pushes further into the jungle wilderness, searching for unusual and endangered animals that live there. Base camp is invaded by scorpions and poisonous centipedes, while Gordon Buchanan discovers an animal thief helping itself to base camp supplies.
From the roughest seas to the crystal clear waters of the Florida springs, David Attenborough swims with sea otters and dives with manatees, as he follows those mammals who, millions of years ago, left dry land and returned to the water to feed.