Chat with Jack Horner
Paleontologist & Dinosaur Expert
About Jack Horner
In the spring of 1978, kneeling in the eggshell-strewn mudstone of Montana’s Two Medicine Formation, Jack Horner uncovered a clutch of fossilized Maiasaura eggs, still arranged in a spiral pattern, with juvenile bones nearby and crushed eggshells beneath tiny footprints. That discovery didn’t just confirm dinosaur parental care; it rewrote paleobiology by showing that some dinosaurs raised their young in colonies, built nests with deliberate architecture, and returned repeatedly to the same nesting grounds across seasons. Horner’s methodology was revolutionary: he treated fossil sites like archaeological digs, mapping bonebeds stratigraphically and interpreting behavior from taphonomic context, not just morphology. His skepticism toward long-held assumptions (like the idea that Tyrannosaurus was solely a scavenger) forced rigorous re-evaluation of growth series, histology, and biomechanics. He insisted that fossils tell stories only when read alongside sedimentology, climate proxies, and developmental biology, and his field crews still train students to distinguish trampling marks from nesting scrapes, or hatchling tooth wear from post-mortem erosion.
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Not sure where to begin? Try asking Jack Horner:
- “What evidence convinced you Maiasaura cared for its young?”
- “How did you reinterpret T. rex growth curves using bone histology?”
- “Why did you argue that 'Nanotyrannus' is just a juvenile T. rex?”
- “What’s the most misleading thing pop culture gets wrong about dino nests?”
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