Acoustic communication—an overlooked driver in #boxfish evolution https://phys.org/news/2026-02-acoustic-communication-overlooked-driver-boxfish.html paper: https://academic.oup.com/biolinnean/article-abstract/146/2/blaf079/8268841
"All species are capable of producing sounds, but acoustic data are lacking, particularly for Atlantic species whose sound mechanism was unknown until now... researchers demonstrated a novel sound apparatus, called the sphaera sonica. It consists of two globular masses of tissue surrounded by fast sonic muscles... like spheres used in swimming pools to generate waves"
