it's pretty rare to actually hear them singing in the wild, and it's even rarer to make such a nice recording. You know, the adult is really crisp and has this short, discreet song, these really rapid ...

It's one of the sounds that ... this young bird - because, even though there are, you know, billions of baby birds born every year, it's pretty rare to actually hear them singing in the wild ...

ZUZANA BURIVALOVA: I got completely transported back to the rainforest in East Kalimantan in Borneo, and I could hear the hornbill right in the middle, this kind of almost dinosaur-like sound. You can ...