In this episode, the hopefuls face their first challenges in the vast swamps of Botswana's Okavango Delta - the size of Wales - where they have to find and film elephants.
They then move on to the Kalahari Desert to track down rhino and then lion, where they are also hit by electrical storms. Judged by award-winning wildlife film-maker, James Honeyborne, if any of them aren't good enough, this will be the end of their journey and they'll be sent home.
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