One would be hard-pressed to take a walk outside without hearing the sounds of calling animals. During the day, birds chatter back and forth, and as night falls, frogs and insects call to defend territories and to attract potential mates. For several decades, biologists have studied these calls with great interest, taking away major lessons about the evolution of animal displays and the processes of speciation. But there may be a lot more to animal calls than we have realized.
Click here for original story, Beyond sound: Red-eyed treefrogs use sound and vibration in calls for mates and aggression
Source: Phys.org