Marmoset Monkey (IMAGE) Cell Press Caption Humans aren't the only species that knows how to carry on polite conversation. Marmoset monkeys, too, will engage one another for up to 30 minutes at a time in vocal turn-taking, according to evidence reported in the Cell Press journal Current Biology on Oct. 17. Credit Leszek Leszczynski Usage Restrictions Credit required License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.