🐒 NEW: Indri #lemurs, #Madagascar’s only #singing #primates, open their mouths wider to hit higher pitches, a vocal technique that parallels human #opera singers. Motion-tracking analysis of #video recordings showed that mouth openings track pitch changes, helping calls carry across dense #rainforest for social bonding and territorial warnings. 👉 https://www.popsci.com/environment/lemurs-opera-singers-share-vocal-technique/ #animals #vocalization #evolution #research #biology #sound #science #forest #wildlife #mammals