Lives without a body, hears without ears, speaks without a mouth, to which the air alone gives birth. What is it?

Why this works

This riddle cleverly describes the nature of an echo using metaphorical language. The phrase "lives without a body" refers to the fact that an echo is a sound wave, it exists as a phenomenon rather than a physical entity. "Hears without ears" indicates that an echo responds to sounds without having the ability to hear, and "speaks without a mouth" means it replicates sounds but does not have a physical form to produce them. Finally, "the air alone gives birth" highlights that echoes are created when sound waves bounce off surfaces in the air, illustrating how they come to be without any physical presence.