SCIENTIFIC AMERICAN : CHATTY TURTLES and THE EVOLUTION OF ANIMAL VOCALIZATION
Listen to the clicks and grunts at this link.
Excerpt: Gabriel Jorgewich-Cohen: I did fieldwork in the Brazilian Amazon with a researcher that published one of these first papers showing that turtles can communicate acoustically, and that inspired me. So I went back home, and I got a piece of equipment, and I started recording my own pets. And I discovered that they were producing sounds as well, and the species I had were not known to produce sounds......
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