Filmed over two years in a remote part of the Canada. Cameras observe a young female grizzly as she grows into adulthood. Filmed over two years, the documentary features vistas of open plains on the Arctic Circle and frigid rivers in vast mountain ranges. Against the backdrop of the vast Yukon tundra, the climate changes from frigid winter to spring thaw with a brief sunny season in-between. The cast of characters features hulking male grizzlies, mothers and cubs socialising until the salmon runs begin. Female bears must consume enough salmon during this brief time in order to sustain the cubs that will be born during the winter.
In this episode, we examine how every animal has what could be called a sense of rhythm - the human-animal included. To give an obvious example, there's our internal body clock which responds to the so-called Circadian rhythm. That's the 24 hour night and day cycle.
In the 1950s, Howard Hughes eyed purchasing the precious Exuma Cays--that is, until the Bahamian government intervened to protect the untouched gems. Set sail with the scientists, tour guides, and guards who have carried on that legacy to protect reefs, patrol waters, and propagate coral.
Thanks to new technologies combining genetics, ethology, geology and even particle physics, paleontologists can now recreate the missing branches of the tree of life. Because of this, it has been discovered that prehistoric mammals were more varied and numerous than previously thought.
There are 200 million insects for each of us. They are the most successful animal group ever. Their key is an armoured covering that takes on almost any shape. Darwin's stag beetle fights in the tree tops with huge curved jaws. The camera flies with millions of monarch butterflies which migrate 2000 miles, navigating by the sun. Super slow motion shows a bombardier beetle firing boiling liquid at enemies through a rotating nozzle. A honey bee army stings a raiding bear into submission. Grass cutter ants march like a Roman army, harvesting grass they cannot actually eat. They cultivate a fungus that breaks the grass down for them. Their giant colony is the closest thing in nature to the complexity of a human city.
Sir David Attenborough tells the stories of the world's best animal architects. There are house-proud bower birds, who only find a mate if they decorate their homes perfectly. There are hornets, who build electric central heating systems, and the star-nosed mole, whose house is designed so well that worms, his favourite meal, literally drop in for dinner. From larders to nurseries and from high-rises to subway systems, Attenborough shows that the animal architects have designed it long before humans.