Along with their vast size and habit of jumping playfully out of the water, whales are renowned for their haunting melodic vocalisations. However, after decades of research, scientists still aren’t sure why these mysterious creatures sing their other-worldly songs. Could it be a form of sexual display? Maybe it’s a method of communication? Or is it possible that the giant marine mammals are using these plaintive moans as a form of echolocation?

Behavioural neuroscientist and author of the book Why Whales Sing Prof Eduardo Mercado certainly thinks so.

In this episode, he tells us how whale songs can last for as long as 40 hours and be heard up to 1,000km away, how, acoustically speaking, whale songs have more in common with bat vocalisations than birdsongs and how ocean noise created by increases in fishing and shipping activity may be wreaking havoc on whales’ ability to navigate the ocean depths.

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