Each winter, a population of humpback whales migrates to its breeding grounds in the Hawaiian Islands. It is here that male humpbacks perform their elaborate and haunting song. Experts are studying the purpose of this song and what it might tell them about the animals' overall fitness.
Duration: 26 minutes and 45 seconds
Episode Number: 1104
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CHANGING SEAS takes viewers on an exciting adventure to the heart of our liquid planet.
The documentary series offers an unprecedented look at how oceanographers and experts study earth's vast underwater wilderness, while shedding light on how over-fishing, global climate change and pollution threaten ocean resources.
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