How Did Dinosaurs Get So Huge?

Part of why we’re so fascinated with extinct dinosaurs it’s just hard for us to believe that animals that huge actually existed. And yet, they existed! From the Jurassic to the Cretaceous Periods, creatures as tall as a five-story building were shaking the Earth.

Season 1 Episode 14 Length 05:42 Premiere: 10/02/17

Recent Episodes

Did Ancient Storms Kill These Pterosaurs?

S8 E13 Length 10:05 Premiere Date 03/17/26

Sensitive Teeth? Blame This Fish

S8 E12 Length 11:08 Premiere Date 03/03/26

The Fiery Rise of Flowering Plants

S8 E11 Length 10:45 Premiere Date 02/10/26

When Ancient Weeds Fooled Us

S8 E10 Length 11:37 Premiere Date 01/27/26

How Brawn Led to Brains

S8 E9 Length 12:14 Premiere Date 01/13/26

When a Tiny Land Bridge Triggered an Ice Age

S8 E8 Length 10:27 Premiere Date 12/17/25

Clips & Previews

A Quick Introduction to Eons

Preview Length 01:28 Premiere Date 06/22/17

Specials

When Dinosaurs Threw Up A Mystery

Length 09:15 Premiere Date 07/22/25

Did Dinosaurs' Extinction Give Us Fruit?

Length 10:47 Premiere Date 07/15/25

Why Paleontologists Can’t Stop Fighting About Spinosaurus

Length 08:37 Premiere Date 07/01/25

The Dinosaurs Too Big To Be Dinosaurs

Length 12:22 Premiere Date 06/17/25

Season 1 Episodes

Show Episodes

Show Clips & Previews

The Two People We're All Related To

S1 E62 Length 08:44 Premiere Date 10/25/18

Your Place in the Primate Family Tree

S1 E61 Length 11:35 Premiere Date 10/17/18

When Giant Amphibians Reigned

S1 E60 Length 09:51 Premiere Date 10/17/18

Can We Get DNA From Fossils?

S1 E59 Length 11:22 Premiere Date 10/03/18

Did Raptorex Really Exist?

S1 E58 Length 12:27 Premiere Date 09/19/18

When We First Walked

S1 E57 Length 10:56 Premiere Date 09/19/18

Life, Sex & Death Among the Dire Wolves

S1 E56 Length 09:15 Premiere Date 09/19/18

The Rise and Fall of the Bone-Crushing Dogs

S1 E55 Length 08:29 Premiere Date 08/28/18

How a Supervolcano Made the Cenozoic’s Coolest Fossils

S1 E54 Length 09:15 Premiere Date 08/28/18

How Horses Took Over North America (Twice)

S1 E53 Length 09:08 Premiere Date 08/14/18

When Birds Had Teeth

S1 E52 Length 11:29 Premiere Date 08/07/18

When Fish Wore Armor

S1 E51 Length 09:37 Premiere Date 07/24/18

The Mystery of the Eocene’s Lethal Lake

S1 E50 Length 07:59 Premiere Date 07/17/18

When Insects First Flew

S1 E49 Length 08:38 Premiere Date 07/10/18

FAQs From Our First Year

S1 E48 Length 09:20 Premiere Date 07/03/18

How the T-Rex Lost Its Arms

S1 E47 Length 06:54 Premiere Date 06/26/18

When Fish First Breathed Air

S1 E46 Length 08:40 Premiere Date 06/19/18

Where Did Viruses Come From?

S1 E45 Length 07:29 Premiere Date 06/12/18

Why Triassic Animals Were Just the Weirdest

S1 E44 Length 09:07 Premiere Date 06/05/18

That Time It Rained for Two Million Years

S1 E43 Length 07:31 Premiere Date 05/22/18

From the Fall of Dinos to the Rise of Humans

S1 E42 Length 12:34 Premiere Date 05/16/18

The Weird, Watery Tale of Spinosaurus

S1 E41 Length 07:28 Premiere Date 05/08/18

The Age of Reptiles in Three Acts

S1 E40 Length 10:45 Premiere Date 05/07/18

How the Chalicothere Split In Two

S1 E39 Length 07:03 Premiere Date 04/24/18

How the Squid Lost Its Shell

S1 E38 Length 08:05 Premiere Date 04/17/18

What Was the Ancestor of Everything?

S1 E37 Length 11:06 Premiere Date 04/11/18

Inside the Dinosaur Library

S1 E36 Length 07:19 Premiere Date 04/02/18

The Most Useful Fossils In The World

S1 E35 Length 05:49 Premiere Date 03/26/18

What a Dinosaur Looks Like Under a Microscope

S1 E34 Length 08:09 Premiere Date 03/19/18

How the Turtle Got Its Shell

S1 E33 Length 08:29 Premiere Date 03/12/18

The Other Explosion You Should Know About

S1 E32 Length 06:25 Premiere Date 03/05/18

How Sex Became A Thing

S1 E31 Length 05:39 Premiere Date 02/26/18

From the Cambrian Explosion to the Great Dying

S1 E30 Length 10:28 Premiere Date 02/20/18

The Whole Saga of the Supercontinents

S1 E29 Length 08:40 Premiere Date 02/12/18

The Great Snake Debate

S1 E28 Length 06:28 Premiere Date 02/05/18

Untangling the Devil's Corkscrew

S1 E27 Length 06:11 Premiere Date 01/29/18

The Time Terror Birds Invaded

S1 E26 Length 05:32 Premiere Date 01/22/18

How Two Microbes Changed History

S1 E25 Length 07:39 Premiere Date 01/15/18

When Giant Fungi Ruled

S1 E24 Length 06:37 Premiere Date 12/18/17

What Happened to the World's Greatest Ape?

S1 E23 Length 07:01 Premiere Date 12/11/17

The Last Time the Globe Warmed

S1 E22 Length 09:54 Premiere Date 12/04/17

The Facts About Dinosaurs & Feathers

S1 E21 Length 10:01 Premiere Date 11/27/17

The Search for the Earliest Life

S1 E20 Length 05:37 Premiere Date 11/20/17

A Brief History of Geologic Time

S1 E19 Length 12:08 Premiere Date 11/07/17

An Illustrated History of Dinosaurs

S1 E18 Length 12:20 Premiere Date 02/15/18

When Whales Walked

S1 E17 Length 04:56 Premiere Date 10/23/17

Living Fossils' Aren't Really a Thing

S1 E16 Length 05:05 Premiere Date 10/16/17

When The Earth Was Purple

S1 E15 Length 05:37 Premiere Date 10/09/17