BBC Earth HD

'S1/E3 - Railways and the Economy'. Michael examines how railways have shaped the world economy. He recalls how the first tracks were laid to shift coal and iron ore, using animals or winches, long before locomotives were invented.

'S5/E7 - Giant Otter Stakeout'. Steve heads into the heart of the Suriname Jungle. He goes in search of poison dart frogs, deadly snakes and hopes to find the elusive giant river otter.

'S5/E8 - South America's Wildest'. Steve searches for deadly animals living in the capital of Suriname. From snakes in people's gardens to snail-catching kites and one of the deadliest snakes on earth.

'S1/E1'. Steve takes us into the dangerous world of crocodiles - one of nature's most fearsome predators - entering croc-infested territory escorted by an armed safari guide.

'S1/E2'. Steve tries to find out if monster crocodiles can still thrive in the Reserve, and encounters five-metre-long Henry. But will he finally find the monster croc he's been searching for?

'S1/E1'. Having been fearful of hippos since a young boy, Steve Backshall sets out to discover why hippos are considered the most dangerous animals in Africa, and if their aggressive reputation is misunderstood.

'S1/E2 - Episode 2'. Having learnt where a hippos aggression comes from Steve wants to find out if we can live alongside the animal that kills up to 500 people a year.

'S5/E7 - Denver'. Starting a mile above sea level in Colorado's state capital Denver, our train, the Rocky Mountaineer makes its way through the state of Utah.

'S5/E8 - France'. Leaving chic 21st century Nice behind, the Train des Pignes, or the 'Pine Cone Train', takes us back to the Provence of the past.

'S2/E1 - Passport'. Hannah gains access to a top-secret site where anonymous staff and the latest tech work to make the British passport one of the most secure documents on the planet.

'S1/E6 - Episode 6'. Lion numbers continue to grow, but there's not enough food to go around. A lioness mum risks her life to feed her five cubs. And Xudum's new-born leopard cubs face a deadly threat.

'S7/E5 - Pork Pies'. Gregg Wallace's popular factory tour show will follow the production of pork pies at the Vale of Mowbray factory, Northallerton

'S10/E8 - Columbia'. Adventurer Ben Fogle meets Vanessa Forero deep in the Sierra Nevada de Santa Marta, an isolated mountain range in the north of Columbia.

'S12/E1 - Series 12, Episode 1'. Sue Aikens sorts her plumbing before the pipes freeze. Ricko spots some moose on the way to laying traps for wolverines.

'S1/E1'. Simon Reeve is back to visit one of Britain's favourite counties to discover what life is really like for the locals after the summer crowds have gone.

'S1/E6 - Episode 6'. Lion numbers continue to grow, but there's not enough food to go around. A lioness mum risks her life to feed her five cubs. And Xudum's new-born leopard cubs face a deadly threat.

'S1/E3 - Episode 3'. In this final episode, the archaeologists complete the excavation of a wealthy residence, a bakery, and a laundry and, in doing so, discover evidence of what people were doing in the city during its final hours.

'S10/E8 - Columbia'. Adventurer Ben Fogle meets Vanessa Forero deep in the Sierra Nevada de Santa Marta, an isolated mountain range in the north of Columbia.

'S7/E5 - Pork Pies'. Gregg Wallace's popular factory tour show will follow the production of pork pies at the Vale of Mowbray factory, Northallerton