This week's programme comes from the tropical Cayman Islands. Michaela Strachan swims with the friendly but deadly stingrays, and takes a submarine adventure off Grand Cayman; Nick Baker discovers how snakes see in the dark; Howie Watkins meets a duck that can whistle, and wonders why the Caymanian iguana is feeling blue. Plus, Janice Acquah gets close to a couple of baby Arabian gazelles.
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