How elephants transmit memories of watering holes.
Each year, during the dry season, the matriarchs guide their herd along trails that their own mothers have shown them. Savanna elephants memorize the location of watering holes over decades and pass this mental map on to younger ones.
A card passed down, not learned
Researchers who follow these movements by GPS observe remarkably stable paths from one generation to the next: the same passes, the same rivers, sometimes the same trees. The road is not an individual habit, it is a knowledge shared by the group.
Young females do not retain these routes in one season. They walk for years behind the matriarch before leading the way themselves, and only succeed after seeing the journey repeated in very different conditions: dry years, floods, dried up water points.
When a matriarch disappears, an entire library of landmarks risks being erased — and the herd sometimes takes years to find certain routes.
What this changes for the protection of the species
This collective memory is now being studied closely: it explains why the protection of elderly females is decisive for the survival of herds.
This is also why losses are not measured only by the number of animals: by targeting the largest individuals, poaching deprives the group of its experience, and the young people who remain face the dry season without the map that went with it.
