Out in the deep swims an elusive whale who has never been seen, but has been heard for years. The whale sings a song outside the normal whale-song frequency. Does that mean none of its fellow whales can understand it? In this episode of Untold, a new YouTubeLearning series from ACS, PBS, and YouTube, we bring you the story of the Loneliest Whale, as well as some of the fascinating science surrounding these gigantic mammals.
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