Summary
Overview
Dr. Beth Shapiro, evolutionary biologist and Chief Scientific Officer at Colossal Biosciences, discusses the science and ethics of de-extinction—bringing back extinct species like woolly mammoths, dodo birds, and dire wolves. She explains how ancient DNA sequencing, genetic engineering, and synthetic biology are being used not just for de-extinction but also for preserving living endangered species. The conversation covers species concepts, human evolution, reproductive biology, genetic modification ethics, and how these technologies could reshape ecosystems and human health.
Species Concepts and Ancient DNA
Dr. Shapiro explains that 'species' is a human concept for organizing life, not a biological reality. She describes how DNA sequencing has revolutionized taxonomy and reveals that humans and Neanderthals interbred, leaving 2-5% Neanderthal DNA in modern humans. The conversation explores how ancient DNA allows scientists to understand evolutionary relationships that fossil records alone cannot reveal, fundamentally changing our understanding of human evolution and species boundaries.
- Species is a human concept for categorization—biology doesn't care what species you are
- Bison were called 'buffalo' by Europeans because all big animals that made good coats got that name, regardless of actual relationship
- Neanderthals and humans diverged 300,000-500,000 years ago but could still interbreed
- Most people have 2-5% Neanderthal DNA, but it's a different 2-5% in each person
- If you collected all Neanderthal DNA from living humans, you'd reconstruct over 90% of the Neanderthal genome
" Biology doesn't care what species you are. Species is a human concept. We have this incredible proclivity to want to put things into boxes so that we can talk about them. "
The Strategy Behind Choosing Species for De-Extinction
Dr. Shapiro outlines the criteria for selecting de-extinction targets: technical feasibility (DNA availability), understanding extinction causes, ecological role, and public engagement. She explains why certain species like woolly mammoths, dodos, and thylacines were chosen—not just for scientific interest but because they generate excitement that drives funding and technology development applicable to saving living endangered species. The chapter emphasizes that de-extinction and conservation use the same toolkit.
- Technical criteria: You need well-preserved DNA samples, ideally multiple specimens
- Must understand what caused extinction to avoid bringing back something that will just die again
- Ecosystems don't wait—niches may have changed or disappeared since extinction
- Excitement about mammoths and dodos drives investment in technology that saves living endangered species
- The dodo was chosen partly because of its cultural recognition and ability to inspire awe
" When we excite people with the idea of mammoths and dodos and thylacines, we get more engagement and enthusiasm and investment in developing the technology that we can use to stop living species from becoming extinct. "
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