Get extended access to 1600+ episodes, binge watch your favorite shows, and stream anytime - online or in the PBS app.
Already a IdahoPTV member?
You may have an unactivated IdahoPTV Passport member benefit. Check to see.
Season 1 Episode 47 | 6m 54s
Tyrannosaurus rex was big, Tyrannosaurus rex was vicious, and Tyrannosaurus rex had tiny arms. The story of how T-Rex lost its arms is, itself, pretty simple. But the story of why it kept those little limbs, and how it used them? Well, that’s a little more complicated.
Aired: 06/26/18
Video has closed captioning.
The Two People We're All Related To
Two humans managed to pass on a very small fraction of their genomes to all of us.
Your Place in the Primate Family Tree
How did we get from a mouse-sized creature that looked more like a squirrel to you?
Scientists have been working for decades to unlock the genetic secrets of the past.
Is LH PV18 a Tarbosaurus bataar? Or a different theropod named Raptorex kriegsteini?
Human ancestors were already walking 3.6 million years ago. But who was first to walk?
Life, Sex & Death Among the Dire Wolves
Dire wolves were real! Their remains taught us a lot about how they lived.
How a Supervolcano Made the Cenozoic’s Coolest Fossils
Yellowstone contains some of North America's most amazing fossil deposits.
How Horses Took Over North America (Twice)
Horses vanished from North America for 10,000 years until a mammal brought them back.
420 million years ago, some fish wore armor – and it may have served a surprising purpose.
Stegosaurs: Tiny Brains & Thagomizers
If you take it as a given that extinct dinosaurs were all weird and wonderful, then you go
We know a lot about dinosaurs but there’s one question that has plagued paleontologists..
Living Fossils' Aren't Really a Thing
Even the most ancient-looking organisms show us that evolution is always at work.
An Illustrated History of Dinosaurs
Our image of dinosaurs has been constantly changing since naturalists started studying the
The Facts About Dinosaurs & Feathers
Dinosaurs have been found with some sort of fluff or even full-on plumage.
We talk to Amy Atwater, Collections Manager at the Museum of the Rockies.
The Weird, Watery Tale of Spinosaurus
In 1912, a fossil collector discovered the world’s only known semi-aquatic dinosaur.
