Expression of concern: ‘Chimpanzee vowel-like sounds and voice quality suggest formant space expansion through the hominoid lineage’ (2022) by Grawunder et al.

© 2022 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited. Expression of concern: ‘Chimpanzee vowel-like sounds and voice quality suggest formant space expansion through the hominoid lineage’ (2022) by Grawunder et al.