During Tanzania's deadly 1993 drought, an elephant matriarch's memory helped save her entire herd, while a younger leader stayed behind and more calves died

During a brutal drought in Tanzania back in 1993, one elephant's memory ended up making the difference between life and death for her entire family. Researchers tracking family groups in Tarangire National Park found that herds led by older matriarchs, elephants who had lived through droughts before, left the park entirely in search of water they remembered from decades earlier, while a herd led by a much younger female stayed put and suffered devastating losses.

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