Bitterns are booming, both literally and metaphorically. These handsome brown birds from the heron family make a noise quite unlike anything else in Britain and we are lucky to be able to hear it. If there is such a thing as a birding bucket list then hearing a bittern’s ‘boom’ — the loudest bird call in the country — should be on it.
Before the bittern starts booming he performs a warm-up ritual called grunting. He strengthens his throat muscles, which expand to turn his gullet into an echo chamber. His powerful muscles make up a fifth of his body weight and can propel the sound of his boom for more than three miles.
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David Butterfield
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As for the sound itself, although it has been recorded at 100 decibels in volume, it is far more musical than the word ‘boom’ suggests.
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