The Dinosaur Record
Why Some Birds Survived the Asteroid That Killed Other Dinosaurs
Seeds, forest loss and early bird fossils help explain survival after the asteroid. Learn which ideas are supported and why wings alone were not enough.
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The Dinosaur Record
Follow the fossil evidence to see how dinosaurs looked, moved, evolved, and lived—and where the science still leaves room for debate.
The Dinosaur Record begins with the evidence that survived: bones, teeth, eggs, footprints, feathers, and the rocks around them. Those clues can reveal how an animal grew, moved, fed, and shared its environment—but they do not answer every question equally well.
Each explanation separates direct fossil evidence from scientific inference and open questions. The aim is not to make dinosaurs look more dramatic than they were. It is to show how paleontologists reconstruct animals and ecosystems that no human ever saw.
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Watch or read the explanation.
Each page includes the original video, a short answer, key points, chapters, and sources.
The Dinosaur Record
Edmontosaurus: A Skin Outline Without the Skin
Ed Junior preserves scales in a thin clay template. Learn what mineral analysis shows, how decay could record the surface, and what a reconstruction cannot prove.
The Dinosaur Record
Dinosaur Injuries: What Healing Bone Proves About Survival
A T. rex tooth in a hadrosaur tail and other healed wounds reveal dinosaur survival. Learn which claims the fossils support and where interpretation begins.
The Dinosaur Record
Did T. rex Have Lips? Teeth, Jawbones and the Remaining Debate
Tooth proportions, enamel wear and jawbone openings support a lipped T. rex, but competing anatomical evidence keeps the reconstruction open to debate.
The Dinosaur Record
Borealopelta’s Last Meal: The Evidence for Ferns
How a distinct stomach mass, microscopic plant tissues and a regional vegetation comparison reveal Borealopelta’s fern-rich meal—and limit the dietary conclusions.
The Dinosaur Record
Centrosaurus Bone Cancer: Why the Fracture Diagnosis Changed
How scans, microscopic sections, and comparisons changed a Centrosaurus leg bone diagnosis from healing fracture to osteosarcoma—and what remains unknown.
The Dinosaur Record
Spinosaurus mirabilis: A Crest Is Not Proof of Combat
Separate the preserved Spinosaurus mirabilis crest from its reconstructed covering, display hypothesis, adult size estimates, and uncertain life around rivers.
The Dinosaur Record
Baby Yingliang: A Curled Pose Is Not a Hatching Clock
Compare Baby Yingliang’s preserved pose with competing age estimates, and learn why a developed dinosaur skeleton does not establish readiness to hatch.
The Dinosaur Record
What Fossilized Dung Reveals About Dinosaur Diets
Bone, decayed wood, and crustacean shells in dinosaur coprolites reveal real meals, with important limits on identity and interpretation.
The Dinosaur Record
How an Ankylosaurus Tail Club Actually Worked
The stiff handle, bony knob, sideways swing, and limits of the fossil evidence behind an ankylosaur tail club.
The Dinosaur Record
Zavacephale Had a Dome Before It Finished Growing
The 108-million-year-old Zavacephale fossil preserves a young pachycephalosaur with a developed skull dome, slender legs and an unusually complete skeleton.
The Dinosaur Record
Birds Are Living Dinosaurs: The Fossil Evidence
Fossil feathers, shared bones, nesting behavior and air-filled skeletons show why modern birds belong within the theropod dinosaur family tree.
The Dinosaur Record
What Dinosaur Footprints Reveal That Bones Cannot
Dinosaur trackways preserve steps, posture, gait changes, group movement, and encounters with soft ground—but every print must be read with geological caution.
The Dinosaur Record
How an Ankylosaur Hatchling Already Had Armor
Bone histology shows that tiny Liaoningosaurus fossils were babies, including one recent hatchling whose armored body had already begun to form.
The Dinosaur Record
The Day the Asteroid Hit: What Actually Killed the Dinosaurs?
Chicxulub caused a regional catastrophe in minutes, but darkness, cooling, acidification, and food-web collapse turned impact day into a global mass extinction.
The Dinosaur Record
The Real Velociraptor Was Nothing Like the Movies
The real Velociraptor was a small feathered Mongolian predator whose famous sickle claw probably gripped prey rather than slashing it open.
The Dinosaur Record
How an Edmontosaurus Mummy Revealed Hoof-Like Toes
A paper-thin clay template preserved the living outline of Edmontosaurus feet, revealing broad hoof-like toe sheaths and a padded heel.
The Dinosaur Record
Doolysaurus: The Baby Dinosaur Hidden Inside a Korean Rock
Micro-CT scans exposed a juvenile dinosaur, skull fragments, and clustered stomach stones inside an unassuming rock from South Korea.
The Dinosaur Record
A Young Gorgosaurus Died with Its Last Two Meals Inside
Fossil stomach contents reveal two young Citipes meals and show why juvenile tyrannosaurs occupied a different predatory role from adults.
The Dinosaur Record
Why Pterosaurs Were Not Dinosaurs
The fossil features that place pterosaurs beside dinosaurs on the archosaur family tree, not inside Dinosauria.
The Dinosaur Record
T. rex Arms Were Small—but Built for Force
What T. rex arm bones reveal about strength, reach, evolution, and the limits of claims about how the dinosaur used them.
The Dinosaur Record
What Changed the Nanotyrannus Debate in 2025
Two mature small tyrannosaur specimens and whole-skeleton anatomy changed the question from juvenile T. rex to a distinct Nanotyrannus lineage.
The Dinosaur Record
How Fona Was Built for Life Underground
How Fona's shoulders, hips, hind limbs, and unusual fossil preservation support a cautious case for a burrowing dinosaur.
The Dinosaur Record
How a Dinosaur Becomes a Fossil—and Why Most Never Do
How burial, groundwater, sedimentary rock, erosion, and excavation turn rare dinosaur remains into scientific evidence.
The Dinosaur Record
How Dinosaurs Grew So Fast—and Why Some Took Longer
How fossil bone tissue, growth marks, and growth curves reveal fast but varied schedules in Maiasaura, Tyrannosaurus, sauropods, and other dinosaurs.
The Dinosaur Record
How Scientists Estimate a Dinosaur's Age From Its Bones
Thin sections of fossil bone preserve growth marks, tissue patterns, and missing chapters that help scientists estimate a dinosaur's age and maturity.
The Dinosaur Record
How Impact Winter Killed the Non-Avian Dinosaurs
How Chicxulub dust, soot, and aerosols darkened and cooled Earth, collapsed photosynthesis, and starved non-avian dinosaur food webs.
The Dinosaur Record
How Water Shaped the Cretaceous Gobi
What Gobi rocks reveal about Late Cretaceous dunes, temporary ponds, rivers, sudden burial, and the landscapes that preserved dinosaurs.
The Dinosaur Record
Why Museum Dinosaur Skeletons Use Casts and Replica Bones
How museums combine original fossils, casts, mirrored bones, and reconstructions—and why a replica can sometimes show one animal more accurately.