Male bitterns make the sound to establish territories and attract mates by opening and closing their bills, gulping air and inflating their esophagus.
The Eurasian bittern, a secretive British wetland bird, announces its presence with a distinctive low-frequency 'boom' during ...
One of the UK's rarest birds has bred on a nature reserve near Hull for the first time in its history. Yorkshire Wildlife Trust (YWT) said a juvenile bittern was spotted at North Cave wetlands last ...
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