The frozen poles are home to the planet's ultimate survivalists, including polar bears, penguins and Arctic wolves; their world is changing fast -- breaking apart under their feet -- and their resilience will be tested beyond the extreme.
Every year, thousands of salmon make their way upstream along the nearly 2000-mile-long mighty Yukon River, desperate to reach spawning beds. Eagerly checking their progress is a host of hungry predators, from grizzly bears to bald eagles-all desperate to stock up on protein before the long winter months ahead.
In a revelatory look at Svalbard, the most northerly region in the series, Steve Backshall leaves no stone unturned as he unravels the secrets that lie covered in ice for most of each year. Svalbard is cold, dark and foreboding, yet it is home to the world's largest land predator and the most northerly population of large herbivore, but Steve discovers that the real secret to this place comes from a very different world.
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?
Professor Richard Fortey journeys high in the Rocky Mountains to explore a 520-million-year-old fossilised seabed containing bizarre and experimental lifeforms that have revolutionised our understanding about the beginnings of complex life. Among the amazing finds he uncovers are marine creatures with five eyes and a proboscis; filter-feeders shaped like tulips; worm-like scavengers covered in spikes but with no identifiable head or anus; and a metre-long predator resembling a giant shrimp.