Titus the gorilla king faces the biggest challenge of his life. He's lived longer and sired more offspring than any other known gorilla, but his time as a great leader may be coming to an end. The mighty silverback has a little orphan in his care - and both their lives hang in the balance. In Uganda, young silverback Marembo is back with his raging hormones and desire to be dominant - he's sure to shake things up a bit.
Learn how rain transforms the area into a lush grazing pasture, creating an abundance of food. Moderate weather makes it harder for predators, as prey can migrate further. With plenty of food available, mating and birthing seasons have arrived.
The first episode introduces the viewers to the continent of Antarctica and the surrounding sea and islands, its glaciers and the icebergs that form from it. It describes how the continent changes throughout the seasons, as it effectively doubles in size in winter when the surrounding sea freezes over, "the greatest seasonal change that takes place on this planet".
Fortey travels to Madeira to examine what happens to a volcanic island as it nears the end of its life-cycle and starts sinking back into the sea. Here, in the island's laurisilva forest, he examines the remains of an ancient forest that once carpeted all of Europe, finds island lizards that live to be four times older than their mainland counterparts, and meets a huge wolf spider. With the help of local divers, he also discovers an unexpectedly rich marine habitat populated by whales, dolphins and unusual deep-sea species that have much to tell us about the changing nature of our seas.
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?