Tori Herridge on ancient dwarf elephants and frozen mammoths

Episode Summary

Executive Summary: The interview traces evolutionary biologist and science communicator Tori Herridge’s career and her research on fossil elephants, dwarf mammoths, and Ice Age ecosystems. It explores how elephant evolution illuminates body size, climate change, extinction, and the importance of preserving modern elephants as living ecosystem engineers, while also highlighting female scientists whose work has been historically overlooked.

Main Topics: Fossil elephants and Ice Age evolution (Priority: 5/5): Herridge explains what counts as a fossil elephant, how mammoths fit within the elephant family tree, and why Ice Age elephants are useful for studying evolution and extinction. Why island elephants dwarf (Priority: 5/5): Her PhD focused on dwarf elephants on Mediterranean islands as a natural experiment for understanding how body size evolves when populations become isolated. Dating ancient fossils with modern techniques (Priority: 4/5): She describes the challenge of dating old remains in warm climates and the use of uranium-thorium, OSL, and electron spin resonance methods when radiocarbon is insufficient. Dorothea Bate and women in science history (Priority: 5/5): Herridge recounts retracing Dorothea Bate’s fieldwork and discovering a broader, under-told history of women paleontologists and archaeologists working in the early 1900s. Science communication and broadcasting (Priority: 4/5): A part-time job at the Science Museum led to broadcasting work, including the mammoth autopsy documentary, and later to her teaching science communication at Sheffield. Ethics and feasibility of de-extinction (Priority: 5/5): Herridge argues against mammoth de-extinction efforts, questioning their necessity and warning against experimentation on living elephants. Climate history and conservation relevance (Priority: 5/5): She emphasizes that Ice Age evidence is crucial for understanding future warming and that modern elephants are essential ecosystem engineers whose loss would matter ecologically and historically.

Key Arguments: Elephants are a powerful model for evolution because their size, biology, and repeated island dwarfing reveal how anatomy and environment interact. Fossil elephant research often depends on new dating methods because older excavations lacked contextual data and organic material often does not survive in warm, humid environments. Island dwarf elephants show that body size can change dramatically under isolation, making them a natural experiment for studying what it means to be large. Historical narratives about women scientists are often too narrow; early 20th-century field science included many women whose contributions were normalized in their time but later forgotten. Science communication is not separate from research; it can extend a scientist’s impact by reaching audiences and training future communicators. De-extinction of mammoths is not justified in Herridge’s view because the claimed benefits do not outweigh the ethical and practical risks to living elephants. Modern elephant conservation matters because elephants are ecosystem engineers and part of the evolutionary backdrop of human history.

Data Points: Current elephant species: 3 - Today there are two African elephant species and one Asian elephant species. Age of the Ice Age / current ice age: about 2.5–2.6 million years ago - Herridge describes the current Ice Age as beginning around this time. Recent past where multiple elephant species existed: 30,000–100,000 years ago - She notes that many more elephant species roamed the Earth in the late Pleistocene. Duration before carbon dating limit: about 50,000 years - Radiocarbon dating becomes unreliable beyond this range for many fossils. Uranium-thorium dating range: up to about 300,000 years - Used on cave formations like stalagmites and stalactites in fossil sites. OSL dating range: about 250,000–300,000 years - Used to date when quartz in sediments last saw sunlight. PhD study regions: Sicily, Malta, Crete, Cyprus - Mediterranean islands where dwarf elephant fossils were studied. Island dwarf elephant height: about 1 metre tall - Some adult dwarf elephants on islands reached only this height. Baby dwarf elephant size: puppy-sized - Herridge describes the calves of these dwarf elephants as very small. Dorothea Bate expedition year: 1904–1905 - Fieldwork in Cyprus and Crete that Herridge retraced. Mammoth autopsy year: 2014 - Herridge participated in the televised necropsy/autopsy documentary. Estimated age of mammoth at death: 47 years - Based on tooth and tusk growth evidence from the preserved mammoth. Estimated number of calves: 11 - Inferred from tusk growth increments suggesting repeated pregnancies/lactation. Year she co-founded Trowel Blazers: 2013 - Organization promoting stories of pioneering women in archaeology and related sciences. Year she had first child: 2015 - Occurred during a very busy period balancing work and broadcasting. Year she left the Natural History Museum: 2017 - She shifted focus to broadcasting for a period. Year she returned on fellowship: 2021 - Returned to the Natural History Museum to research fossil elephants, especially teeth.

Pivotal Quotes: "A mammoth is just a special kind of elephant." — Tori Herridge: Used to clarify taxonomy and place mammoths within the elephant family tree. "Why do they always stop being big?" — Tori Herridge: Her central evolutionary question about island dwarfing in elephants. "There are so many stories to be told." — Tori Herridge: Her rationale for creating Trowel Blazers to highlight overlooked women scientists.

Implications: The episode links extinct elephants to modern conservation, showing that Ice Age science informs climate prediction, biodiversity loss, and ethical debates on de-extinction. It also argues for preserving hidden scientific histories and using communication to broaden access and impact.