Marmoset monkeys take it in turns to "talk" in a pattern very similar to human conversation, say scientists.
Researchers recorded 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.
In this clip, you can hear one of the recorded marmoset conversations.
Audio courtesy of Daniel Takahashi, Darshana Narayanan and Asif Ghazanfar