Once shot to the brink of extinction wild wolves are now returning to the United States with a vengeance. They are crossing the Canadian border and tension is mounting. A team of biologists track down these top predators to find if there is something special about these wolves that are helping them survive.
Sydney Harbour has undergone a remarkable journey, moving from the quiet home for a tiny indigenous population to a prison camp for convicts and now a powerful financial capital.
In the final episode, John, Lyn and Luke arrive in the Northern Territory on the advanced stage of their course. For the first time there are no fences to hide behind. John and the students travel to Arnhem Land by helicopter, and raid crocodile nests in the wild.
For the past 18 months, croc expert John Lever has worked with scientists from the University of Queensland to develop a world-first artificial insemination program for saltwater crocodiles. Semen has successfully been collected from crocs in captivity, but John and two students of his choice will attempt to do it in the wild. As they'll also need to raid croc nests during the Kakadu field trip, John teaches the students how to do it on the farm first.
In episode 4, the crocs get even bigger and petite Renee impresses John with her ability to catch an angry nesting female. At 150 kilos and three times Renee's size, it's the largest the students have tackled so far.
In this final episode, it's winter in the forest and after a heavy snowfall the wood is looking magical. With fresh snow on the ground Jimmy can trace the footprints of the animals and birds in the wood.
In Episode 3, the crocs get larger and the students learn about life and death on a crocodile farm. First, John gathers the students to observe baby crocs hatching. These tiny crocodiles cannot draw blood - yet.
High up in a spectacular tree house, Jimmy Doherty develops an intimate understanding of the inner workings of a British forest. It's now autumn, and the forest is bursting with fruit and nuts and is looking spectacular.
In the second episode, John's son Adam gives a lesson in how to snare small crocodiles using rope and a pole - a difficult task, as the crocodile can only be captured once it has exhausted itself at the end of a rope. Used to being in control, former police officer Tony comes up against a particularly defiant little crocodile that tests his forcefulness.
In this episode, it's summer and Jimmy's determined to see the badgers in the large sett near his tree house; an ambition which proves to be quite a challenge.
Croc College follows six ordinary Australians as they embark on one of the most thrilling and dangerous training courses Australia has to offer. Led by Queensland croc legend John Lever, the students learn how to handle, farm and manage the world's oldest and largest living reptile - the saltwater crocodile. They also study the hardcore and sometimes ethically confronting business side to croc farming, and some take part in a groundbreaking scientific artificial insemination project.
Farmer and television presenter Jimmy Doherty wants to experience the British forests first hand. From a beautiful tree house constructed across two large oak trees, Jimmy charts the unfolding of the four seasons.
Migrations are ticking clocks: animals must move or die, driven by changing seasons and climates. They race to reach their destinations before it's too late to breed, feed or simply stay alive.
Every migration is an epic journey, driven largely by hunger. Every day, trillions of creatures, from microscopic plankton to rare desert elephants face arduous journeys in search of greener pastures.
Witness awe-inspiring stories of species' need to reproduce such as stunning footage of flying foxes soaring across the skies with their young wrapped in their wings and the remarkable breeding behaviours of elephant seals in the Falkland Islands. For the first time in nearly 30 years, see the white-eared kob performing a deadly mating ritual in Sudan.
Every day, millions of creatures are born into a life on the march, on the wing, on the run. From the tiniest butterflies to the largest wildebeest, these migrants lives hinge on the ability to get up and go.
This clip explains what causes tides and the effects of tides
A 6'7" Aussie who lives in a one-room tin shed in Alice Springs and spends his life saving orphaned baby joeys has become the toast of Britain. Since childhood, Chris 'Brolga' Barnes has been infatuated with Australia's most iconic animal, and now spends his life rescuing and raising hundreds of orphan joeys for release back to the wild.
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