Ezalor
Member
Turtles don’t have vocal cords, and their ears are internal, so scientists believed that turtles were deaf and didn’t communicate through sounds. But research has found that turtles actually communicate at an extremely low frequency that sounds like “clicks, clucks, and hoots” that can only be heard through a hydrophone (a microphone used underwater). These sounds even come from the egg before the turtle hatches. Researchers hypothesize that this helps all the turtle siblings hatch at once.
I never knew turtles could communicate like that. It's amazing how scientists keep discovering new things about the world around us. 
After all, turtles are among the animals you don't usually hear talking.