Yeah, but that's a poetical reference to the turtledove, so that doesn't serve as evidence.

Snapping turtles communicate real well with hissing and snapping their sharp jaws.

And I ask again about "voice." Having a voice (making yourself understood) doesn't require making a sound. We can observe many "silent" creatures and make accurate deductions regarding what they want us to know ("don't step on me" "feed me" etc.)

SRS