The inside of a termite mound proved especially challenging for Attenborough: it was so cramped that he could only face in one direction. He therefore had to slowly crawl backwards out of shot when performing re-takes.
The final programme looks at the superorganisms formed by bees, ants and termites. Attenborough reveals that their colonies, whose individuals were once considered purely servile, are "full of conflict, power struggles and mutinies." They evolved when such creatures moved away from a solitary existence and started building nests side-by-side, which led to a collective approach to caring for their young.
The Comb-crested Jacanas are unique birds that use their long toes to walk delicately across lotus leaves and catch underwater prey. This episode, filmed between the rainy season and dry season in Kakadu, follows a father bird raising his chicks through their dramatic and difficult first year.
Diablo the giant otter lives in a lake in the jungles of Peru, with his unruly family of six cubs. Even at the tender age of six months, they need to learn how to survive in this dangerous paradise. Their dad teaches them to swim and eventually to catch piranha for themselves, but they must also learn to stay away from the neighbours from hell - the giant caiman. These large members of the crocodile family are a real threat to the giant otter family and Diablo must go to extraordinary lengths to try to protect his cubs. Charlie Hamilton-James returns to the place he first filmed Diablo. Following the family over several months, sometimes in very difficult conditions, he discovers how perilous a home this is for the cubs and watches them develop under the careful guidance of their father. He also films remarkable scenes of the giant otters fighting caimans.
Remote islands offer sanctuary for some of the planet's strangest and rarest creatures. The rare pygmy three-toed sloth enjoys a peaceful existence on an idyllic Caribbean island, while nesting albatross thrive in predator-free isolation. But island life always comes at a cost. On the Galapagos Islands, young marine iguana must escape an onslaught of deadly racer snakes the moment they hatch from the sand. On the sub-Antarctic island of Zavodovski, life gets more extreme still. Every day, one and a half million penguins risk being battered against the rocks by fierce waves as they try to get on and off the island.
Animal Reunions have captured the imaginations of millions of people worldwide. YouTube is full of animal reunion stories - moments that illustrate and capture genuine affection and emotion between and among species. These rare moments provide a fleeting window into the emotional capacities of animals and their ability to form bonds with humans. But can wild animals really feel joy, devotion and love? Most animal lovers are convinced that they do, and now scientists are beginning to agree as we discover the stories that bring those animal emotions to life. We meet orphaned elephants in Kenya who have learned to trust their nursery keepers even after they lost their families at the hand of man - and witness a deep bond revealed as the head keeper travels to the National Park to see if his fully grown elephants remember him. We meet Damian Aspinall, the first man to release a captive-bred family of gorillas back to the wild, and see his reunion with one of those gorillas, proving a bond that may last a lifetime. We also meet Jane Goodall, the legendary chimpanzee researcher who was once heavily criticized for her claims about animal emotions; and Rebeca Atencia, the veterinarian who runs a Congolese chimp sanctuary set up by Goodall, as she travels to find the orphan chimpanzee she raised and released back into the wild. Through these incredible stories about human-animal relationships, illuminated by interviews with some of the world's most eminent ethologists and academics, this film sets out to question not only the emotional intelligence of animals but the so-called divide between us and them.