New study finds bonobos can keep track of human voices and position, even when they’re out of sight

Researchers at Johns Hopkins University’s Social and Cognitive Origins Group spent time playing hide and seek with a bonobo.

This helped them uncover that this bonobo called Kanzi was able to keep a tab on which human caretaker was where — even when they were out of sight. Most of time, Kanzi guessed the hiding location of the humans accurately. Kanzi was also able to recognise the researchers by their voice alone.

You can read more about this research in the Johns Hopkins' post titled: "For apes, out of sight isn't out of mind"