This sound is made by both adult South American river turtles and hatchlings and is used to communicate with one another. 

Adult turtle sound

This sound is made by South American river turtle hatchlings.

Hatchling sound

Here are four tracks from The Flood, by The Lyre Ensemble, with Stef Conner on vocals, Andy Lowings on lyre, and produced by Mark Harmer.  

Dumuzid's Dream

Lullaby

The Flood

Ishtar's Descent

Here are four tracks from The Flood, by The Lyre Ensemble, with Stef Conner on vocals, Andy Lowings on lyre, and produced by Mark Harmer.  

Read about it here: 
http://www.newsweek.com/what-did-ancient-mesopotamian-hits-sound-something-291543

Order album here:
http://lyre-ensemble.com/admin/?page_id=93

Popular tracks by Newsweek Tech & Science