BBC Earth HD

'S12/E8 - Night Country'. Alaskans soldier through the heart of dark winter in pursuit of the resources they desperately need for survival.

'S12/E9 - Rites of Winter'. The everyday struggles of living in the secluded state of Alaska where one wrong decision could cost you your life.

'S4/E1 - Taiwan'. A voyage around the island of Taiwan.

'S4/E2 - Austria'. Cameras focus on Austria's stunning Transalpine railway, which crosses the snowy peaks of the Tirol. The journey begins in the historic city of Graz and heads west through famous alpine beauty spots.

'S2/E6 - Cities'. Cities are the fastest growing habitat on Earth, but life in the man-made world is not easy for animals. Will the future see cities designed for wildlife too?

'S1/E1 - From Pole to Pole'. This episode journeys across the planet, from pole to pole, following the influence of the sun and discovering how its seasonal journey affects the lives of all who live on earth.

'S11/E8 - The Rising Tides'. The Alaskans push through the deep cold to increase their odds of survival.

'S11/E9 - The Silent Hunter'. Alaskans stand their ground as winter brings one final barrage.

'S11/E10 - Paving Paths'. Alaskans brave the awakening landscape as the end of Winter nears.

'S4/E1'. Armed with his 1899 Appleton's Guidebook to Alaska, Michael Portillo begins his journey amid the snow-capped mountains and ice-cold inlets of the Kenai Peninsula.

'S4/E2'. Portillo rides the Alaska Railroad north to explore the remote former goldrush settlement of Talkeetna.

'S4/E3'. Arriving in Skagway by seaplane from railway-less Juneau, Michael Portillo heads for Dyea and the Chilkoot trail, which the first gold prospectors hiked 100 years ago to the Klondike.

'S4/E4'. Michael Portillo explores British Columbia. He discovers how two superpowers nearly came to war over a pig and joins the Royal Canadian Navy to firefight on board the frigate HMCS Regina.

'Attenborough And The Jurassic Sea Monster'. 150 million years ago, dinosaurs ruled the land, but the oceans were dominated by a mysterious sea monster. Meet the pliosaur, the Tyrannosaurus rex of the seas!

'S6/E9 - Otter Hide and Seek'. Steve Backshall dives into the world of the caiman, learns about the plight of the world's biggest parrot and tries to find his nemesis - the giant river otter.

'S6/E10 - Snake Island'. Steve Backshall heads to a place very few people ever go: Snake Island in Brazil, where the concentration of snakes is higher than anywhere else on earth.

'S1/E2'. Halfway through their trek, Lucy and the team face dense forests and the ever-present threat of elephants, as rations run dangerously low.

'Sue Perkins' Big Adventure: Paris To Istanbul. S1/E4'. Sue puts on her dancing shoes and blags a backstage pass at Budapest's hottest party. The morning after, the city's soothing hot springs beckon.

'S1/E3'. As Alexander moves deeper into Persia, he confronts the final unravelling of Darius' power and the political consequences of the king's death.

'S1/E1 - In Search of the Source'. Ash and his team battle rapids, dense jungle and wildlife to uncover the hidden source of the Coppename River.

'S1/E1'. How did a small island create the biggest empire the world has ever seen? David Olusoga uncovers a living legacy.

'Attenborough And The Jurassic Sea Monster'. 150 million years ago, dinosaurs ruled the land, but the oceans were dominated by a mysterious sea monster. Meet the pliosaur, the Tyrannosaurus rex of the seas!