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Liz Hawkins: I threw my hydrophone and the dolphins were facing us so we should have been able to hear every sound they emitted. Why weren’t they emitting anything?
Boat noise occurs at roughly the same frequency as normal dolphin communication. So in the face of overwhelming interference, were the dolphins simply giving up and going mute?
Or, as Liz began to suspect, were the supposedly silent dolphins actually doing something much cleverer.
And with the realisation dolphins could change frequency, Liz had a brainwave about the mystery of the silent dolphins from Port Phillip Bay.
What if when boats were around, they weren’t silent at all.
What if, they too had cleverly worked out how to switch channels.