For apes, out of sight isn’t out of mind
Peer-Reviewed Publication
Updates every hour. Last Updated: 25-Dec-2025 07:11 ET (25-Dec-2025 12:11 GMT/UTC)
A series of hide-and-seek experiments with a bonobo named Kanzi shows for the first time that apes can mentally keep track of multiple familiar humans at once, even when they are out of sight. Kanzi could also recognize caregivers from their voices alone, an ability never before tested on bonobos.