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How an Evolutionary Arms Race Created Bizarre Dino Designs

5m 32s

It’s attack vs defense on an epic evolutionary scale. Utahraptor was the largest raptor to ever walk the Earth, honing its weapons and tactics to become a truly apex predator. And top of Utahraptors’ dinner wish list was Gastonia. But Gastonia were the spikiest dinosaurs to ever lived, covered in thick armor and developing their own deadly weapons with which to fight back.

Aired: 06/14/25
Extras
A fight breaks out amongst the mega herd of Pachyrhinosaurus gathering to migrate north
A young Albertosaurus, a relative of T. Rex, earns her place in a fierce hunting pack.
Very few dinosaurs made it as far North as the Arctic Circle...except for two.
In late Cretaceous Alberta, many apex predators roamed free, so how did the prey survive?
Imagine finding a rare fossil that you’ve been desperate to find - only for it to be put at risk.
What would make a Utahraptor so much larger than other raptor species?
An injured Lusotitan lies on the beach, vulnerable to attack from the deadly Torvosaurus.
In an attempt to initiate a courtship dance, a male Lusotitan puts his best foot forward.
Staying close to the herd is the only chance for baby Pachyrhinosaurus to survive danger.
Albertosaurus work as a group to hunt down prey much larger than they are.