- Apes Have Been Observed Starting And Ending Interactions Just Like Humans Do ScienceAlert
- Like humans, apes communicate to start and end social interactions Phys.org
- Bonobos Appear to Say 'Hello' and 'Goodbye' to Each Other Gizmodo
- Apes say hello and goodbye and judge each other's politeness, incredible study finds Daily Star
- View Full coverage on Google News