A team of researchers at the University of Turin, working with a colleague from the Max Planck Institute for Psycholinguistics and another from Aarhus University and The Royal Academy of Music, has found that the lar gibbon tends to be more isochronous (repeating notes more regularly) when singing as part of a duet with a member of the opposite gender. The research is published in the journal Proceedings of the Royal Society B: Biological Sciences.
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Source: Phys.org