The story of how more than 220 dinosaur bones were found in the Argentinean desert, which were found to have come from a previously undiscovered species, which is the largest land dwelling animal known to have existed. David Attenborough visits the archaeological dig and a laboratory where the remains are being cleaned and analysed with lead scientist Dr Diego Pol and evolutionary biologist Ben Garrod, and meets animators, model-makers, paleontologists and anatomy experts who are working to reconstruct what the 37 metre-long creature would have looked like.
In this second episode we travel from January to the March equinox. Kate Humble gets closer to the Sun than she has ever been before, whilst Helen Czerski visits a place that gets some of the biggest and fastest snowstorms on Earth.
For many animals, group living offers protection, better food, and more social opportunities. For their young, it's a valuable education. From flamboyant flamingo mating dances, to elephant calves growing up under the watchful eye of the group matriarch, peer into some of nature's most tight-knit social groups.
Across the dunes of the Kalahari, a towering, 200-year-old tree extends its branches to the heavens. This camel thorn Acacia is a secret refuge for those in the know. Colonies of sociable weavers use its branches for their oversized nests. Oryx, kudu, and other herbivores feed on her ripened pods, helping soften the seeds for germination. As the rainy season descends, its branches become draped with golden flowers, a magnet for pollinating insects. For many, the Acacia is a 'tree of life.' It's a relationship as old as the Kalahari itself.
With coastal mangrove forests, seagrass beds, and vibrant coral reefs, the Florida Keys are home to a wealth of underwater environments, all connected by what scientists have dubbed the 'Corridor of Life.' Take a journey through the vital underwater sanctuaries that preserve these delicate ecosystems.
Sharks are more than just hunters. Only now are discoveries revealing a hidden side to their character. They have an intricate social life, complex courtship rituals, surprising ways of bringing up their young and extraordinary powers of navigation. They can forge relationships with the strangest of partners, even humans.