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).

但研究发现海龟其实是用极低频率的声音像咳咳咳，这种声音只能用水下麦克风听见，这个声音甚至在他们孵化以前就有