You'd think TV crews would be hard-pressed to find any corner of the planet that hasn't been filmed, but it turns out that in the Amazon rainforest there's a habitat where no cameras have ventured: the river itself. The reason is that the water's so murky that diving into it is like taking a swim through a bowl of oxtail soup. But that doesn't deter Kate Humble and friends. In a vessel that looks like a Mississippi showboat they set out to capture the Amazon's spooky wildlife. Every other creature here seems to have giant in its name - stingrays, otters, sponges and, most elusive of all, the giant catfish known as a jau which has never been filmed.
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