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1. Introduction Adult male humpback whales (Megaptera novaeangliae) sing mainly during breeding seasons. The objective is possibly to attract females and/or for male–male interactions (identification and localization of the individuals) during sexual competition. Vocalizations, called a song unit (SU), are separated by silences and are emitted in a temporal order [1]. These SUs are organized in time into subphrases, and successive subphrases become phrases.
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