Blue whales are known to create the loudest noise of any living creature to communicate across vast distances. Now, a new study has found that they can also hear sounds beyond their vocalisation range.
In their study, researchers at the Scripps Institution of oceanography observed the response of blue whales in the Southern California Bight in the middle frequency sounds created by military sonar, which takes place between 1000Hz to 8000Hz, much higher than a blue whale calls, which is 100Hz and lower.
They collected thousands of hours of recordings over two summers, and found that, when mid-frequency active (MFA) sonar (which is used to find submarines) has been active in the region, blue whales' low frequency voice, known as "D-calls "fell almost half, the 'Discovery News reported.
The researchers say that it is a sign that despite being well out of the whales' vocalisation range, relatively high-frequency sounds in their ears range.
One possible explanation for being able to hear sounds from such a high frequency, lead researcher Marian Melcon suggests, "is that it may be advantageous, for example, to hear their predators, ie, killer whales, which vocalise at the same frequency as the range MFA sonar."
Conversely, when confronted with the noise of ships, which largely falls within their vocalisation territory, the whales increased their D-calls - which, the researchers said "may be the vocal response of the animals to overcome the noise."
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