“I was going out to Interlaken to put a recorder out because, in previous years, they had been heard out there,” he said. “The site I wanted to get to, I couldn’t, for various reasons. I was driving ...

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 ...

Don't miss out on the headlines from Tasmania. Followed categories will be added to My News. “I was going out to Interlaken to put a recorder out because, in previous years, they had been heard out ...