Broadcaster Sir David Attenborough dropped in to talk to Salford University attendees studying wildlife documentary production to launch the course with some fun facts.
The wildlife veteran, who famously interacted with gorillas directly as part of his BBC shows, told of how he combined custard powder and silk tights
to imitate the sound of polar bears rolling around in the snow.
Sir David used the hosiery
trick to produce a more moving experience for the viewer while not interfering with the animals during filming.
He told the assembled masses: "Is the use of custard powder wholly irresponsible?
"Actually I'd argue it is wholly responsible. Polar bears are dangerous animals and to have sound with vision creates atmosphere and impact."
Sir David's most recent programme for the BBC was Life in Cold Blood, where he explained the lives of reptiles and amphibians.
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