Short Wave What crocodile bones teach us about dinosaurs
9 snips
Mar 9, 2026 
Ari Daniel, a science reporter who investigated crocodile bone growth, visits a reptile center and follows researchers tracking bone banding. The story explores how crocodiles, dinosaur relatives, show multiple growth marks per year. Short scenes cover lab microscopy, surprising results, and scientists debating how to reliably age ancient animals.
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How Ring Counting Became The Standard For Dinosaur Ageing
- Paleontologists count growth rings in fossil bones assuming one ring equals one year to estimate dinosaur ages and growth rates.
- This tree-like ring method produced estimates like a 20-some year timeline for T. rex to reach adulthood, shaping many dinosaur life histories.
Fieldwork Among 170 Nile Crocodiles At Le Bon Air
- Researchers studied about 170 Nile crocodiles at Le Bon Air Reptiles near Cape Town to compare living relatives with dinosaur bone growth.
- The setting included pools and pedestrian bridges and researchers photographed and observed animals directly to link behavior with bones.
Using Antibiotic Markers To Time Bone Growth
- Researchers injected antibiotics into young crocodiles; the drugs get incorporated into bone and act as time markers for later histology.
- This allowed tracking of exact timing of bone deposition in individuals that were later analyzed at age two.