Mini creatures with mighty voices know their audience and focus on a single frequency https://theconversation.com/mini-creatures-with-mighty-voices-know-their-audience-and-focus-on-a-single-frequency-192810
Some #insects amplify their sounds by building the functional equivalent of audio speakers. Some tree #crickets chew holes in leaves, place their vibrating wings in the opening and use the surrounding leaf as a baffle to prevent the loss of sound energy around the edges of their wings. #MoleCrickets go even further by constructing a burrow that acts like a wind instrument.