A team of scientists led by UNSW Sydney are confident they’ve discovered a new population of pygmy blue whales, the smallest subspecies of blue whales, in the Indian Ocean.
And it was the whales’ powerful singing – recorded by underwater bomb detectors – that gave them away.
The discovery was made possible using data from the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO), an organisation that monitors international nuclear bomb testing.
The UNSW-led team were studying the data when they found an unusually strong signal: a whale song that had previously been identified in the recordings, but that scientists still knew little about. After closely studying its composition (details like the song’s structure, frequency and tempo), they realised that it belonged to a group of pygmy blue whales – but not any of the ones previously recorded in the area.
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