Nick Longrich on discovering new dinosaurs from overlooked bones

Episode Summary

Executive Summary: The episode follows paleontologist Nick Longrich’s path from nature-filled Alaska to major dinosaur discoveries, emphasizing how careful attention to tiny fossil differences can reveal new species. He explains fieldwork and museum research, the role of chance and persistence, how rare global events shape evolution, and why scientific progress depends on staying open to being wrong.

Main Topics: Growing up in Kodiak and learning to notice differences (Priority: 5/5): Longrich’s childhood in Alaska, tide pooling, beachcombing, and observing species variation trained him to spot subtle anomalies in bones and living creatures. From art and fishing to science (Priority: 4/5): His parents’ influences—art materials from his mother and fishing from his father—shaped creativity, resilience, and comfort with the hard, repetitive work of science. Museum fossils and discovering new dinosaurs (Priority: 5/5): He describes identifying unusual fossils in museum collections, including a Moroccan skull fragment that may represent a distinct Carchodontosaurus species and the raptor Hesperonychus. Scientific career path and imposter syndrome (Priority: 4/5): Longrich discusses leaving an ill-fitting PhD program, rebuilding his path through fishing and travel, and later thriving in Canada, Yale, and Bath despite self-doubt. Evolution, biogeography, and rare events (Priority: 5/5): He argues that improbable events over long timescales—rafting across oceans, asteroid impacts, and mega-events—can strongly shape evolution and distribution of species. Challenging assumptions in paleontology (Priority: 5/5): He explains debates over tyrannosaur species and the broader lesson that scientists must revise views when evidence changes, even when that means overturning accepted ideas.

Key Arguments: Tiny anatomical differences matter: repeated comparison across many specimens allows scientists to identify outliers that may represent new species rather than juveniles or misidentified fossils. Museum collections are rich scientific resources because many specimens are miscataloged or underexamined, making them as important as field sites for discovery. Persistence matters in research: the Hesperonychus find came after years of checking drawers and following small clues until a crucial specimen appeared. Rare events are evolutionarily important when viewed over millions of years; processes that seem improbable in human timescales become likely across deep time. Ocean crossings likely explain surprising fossil distributions, such as duck-billed dinosaurs in Africa and primates reaching Africa by rafting. Mass extinctions did not spare most groups; birds, mammals, and lizards were heavily affected, and modern diversity reflects survivor radiations rather than immunity. Scientific progress requires intellectual flexibility; the best scientists are willing to change their minds when evidence contradicts prior assumptions.

Data Points: Age of Moroccan fossil fragment: 100 million years - Longrich says the bone was last seen by a dinosaur and recently exposed to sunlight after being buried for roughly 100 million years. Kodiak Island population: 10,000 people - He describes his Alaska hometown as a small community where most people knew one another. Run-in with bear distance: 30 feet away - As a teenager skipping school, he encountered a Kodiak bear at close range in the woods. Education year: 1998 - He graduated from Princeton and then moved to Chicago for doctoral study. Postdoctoral move: 2009 - He began a postdoc position at Yale in 2009. Dinosaurs found by Longrich: Over a dozen new species - The interviewer notes his record of discovering more than twelve new dinosaur species. Hesperonychus size: About 1 meter long - The tiny raptor-like dinosaur he helped identify was described as small, around one meter in length. End-Cretaceous extinction timing: 65 million years ago - Referenced in discussion of the asteroid impact that ended the non-avian dinosaurs. Biodiversity survival estimate: As few as 3 bird species - Longrich says DNA suggests all living birds trace back to a very small number of survivors after the extinction. Lizard extinction: 80% extinction - He notes lizards were also heavily affected at the end-Cretaceous event. Primates arriving in Africa: Around 50 million years ago - He argues primates reached Africa later by rafting across water.

Pivotal Quotes: "the only authority that's never wrong" — Nick Longrich: He describes nature as the ultimate guide in his scientific worldview. "The whole point of science is that we're ignorant" — Nick Longrich: He explains why uncertainty and revision are central to scientific progress. "If you eliminate the impossible, then whatever remains, no matter how improbable, must be the truth." — Nick Longrich: He invokes Sherlock Holmes to explain how unexpected biogeographic patterns may still be correct if supported by evidence.

Implications: The episode shows that paleontology advances through curiosity, persistence, and humility. Listeners are left with a clearer sense that museums, deep time, and rare events can rewrite evolutionary history when scientists stay open to surprise.