Monkeys take turns in conversation
17 October 2013 Last updated at 17:14 BST
Marmoset monkeys take it in turns to "talk" in a pattern very similar to human conversation, according to scientists.
Researchers recorded the vocalisations of the marmosets as they called to one another from behind a curtain.
Each animal would call, then wait for the other to respond before calling again.
The results suggest an "alternative evolutionary route" for our own conversational turn-taking.
In this clip, you can hear one of the recorded marmoset conversations.
Audio courtesy of Daniel Takahashi, Darshana Narayanan and Asif Ghazanfar