The Falls

5th August 2004 30 mins Season 1 Episode 4

Every year 300 million salmon return to the Alaskan river where they were born, but they are swimming into a trap. The upstream waterfalls are preyed upon by grizzly bears and bald eagles. How do the salmon survive the onslaught?

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Season 1 · Episode 5

The Edge

When thousands of young Adelie penguins leave the colony to start their adult life at sea, they face a terrifying ordeal. A huge predatory leopard seal is waiting for them just offshore. But which penguin chicks will get through? Is survival down to luck, or can past actions influence a penguin's fate?

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