How scientists discovered that animals are doctors, too

September 11, 2026

AI Summary

5 min read

In 1987, biologist Michael Huffman was following a group of chimpanzees in Tanzania when he noticed something unusual. One of the mothers, named Chausiku, was eating a tropical shrub called the bitterleaf plant—something normally toxic and not part of the chimps' regular diet. She was lethargic and seemed sick. She peeled off the bark and leaves, chewed and sucked the juicy inner part, then spit out the fibrous remains. Within 24 hours, she recovered—roughly the same time it takes humans to recover from intestinal upsets and malaria when using the same plant. Huffman's guide, a game officer named Mohamedi, told him that traditional healers had long known about plants named after the animals they saw using them. "I literally almost fell off the log that I was sitting on," Huffman recalled. The observation launched a slow, painstaking scientific revolution.

Proving what animals already knew

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What you'll learn

1 Main Outline
2 (00:21) **Setting Up the Question** - Host Nate Rapp introduces science journalist Mandy Nguyen to discuss animal self-medication
3 (01:27) **Previewing the Animal Medicine Cabinet** - Examples of animal self-treatment are introduced to show the scope of the phenomenon
4 (03:51) **The Origin Story: Chimp Chaosiku** - How the field began with a 1987 observation by biologist Michael Huffman in Tanzania
5 (04:51) **The Indigenous Knowledge Connection** - Huffman's local guide revealed that traditional healers already knew about animal medicine
6 (06:28) **Proving the Hypothesis** - The decade-long scientific process to confirm that chimps intentionally use medicine
7 (07:40) **Expanding the Animal Pharmacy** - Scientists have since found self-medication across many species beyond primates

+ Full timestamped outline available in the app

Show Notes

When people are sick, we seek out medications and treatments to help heal. For a long time, scientists thought that was a uniquely human ability. But it turns out, many other animals do a version of it too! And since the late 1980s, western researchers have been trying to get a peek behind the curtain. And aside from just cataloguing all the cool examples just to know, there’s a real hope that studying animals’ medical cabinets may be the most promising way to expand our own. We get into the weeds with freelance science journalist Mandy Nguyen.

Interested in more animal stories? Email us your ideas and questions to explore at [email protected]. They may become a future episode!

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