Attached is an interesting publication in Current Biology regarding
vocalization patterns of Marmoset monkeys.
These monkeys were used to determine whether non-human primates exhibit
cooperative vocal communication by taking turns speaking. Results of these studies showed that they do
indeed take turns in extended sequences and that the pattern is characteristic
of a coupled oscillator (similar to humans).
Since marmosets are on a different branch of the evolutionary tree, this
could very well be convergent evolution of vocal cooperation.
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