As the competition draws closer Australian Dan James arrives, ready to give the five trainers some tough competition.
Beavers and grizzly bears retreat under cover from the endless blizzard, while wolves, red foxes and river otters face winter head on.
In summer, Yellowstone transforms into a wildlife paradise with a cruel dark side as grizzly bears emerge from mountain dens to roam for food.
An epic biopic of one female wolf, following her against-the-odds rise to a position of extraordinary power for a female: leader of her pack.
One of the last wildernesses in Europe straddles Slovakia, Poland and Ukraine. It's home to beavers, huge bison, deer and wolves.