The Eurasian bittern, a secretive British wetland bird, announces its presence with a distinctive low-frequency 'boom' during ...
Male bitterns make the sound to establish territories and attract mates by opening and closing their bills, gulping air and inflating their esophagus.
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This elusive bird can be heard up to 5km away – and the sound it makes is extraordinary
The song of the male bittern – the king of the reedbed – sounds like a foghorn.
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