AUTHOR=Wacewicz SÅ‚awomir TITLE=Commentary: Why Are no Animal Communication Systems Simple Languages? JOURNAL=Frontiers in Psychology VOLUME=12 YEAR=2021 URL=https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2021.763445 DOI=10.3389/fpsyg.2021.763445 ISSN=1664-1078