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Eons

The Traits That Spawned the Age of Mammals

Season 4 Episode 2 | 7m 44s

Lots of the traits we think of as defining us as mammals show up pretty early, during the time of the dinosaurs. And, in some cases, they show up a lot earlier and in things that weren’t mammals at all.

Aired: 07/20/21
Extras
Watch • 12:40
Eons
The Golden Age of Sharks
Why did sharks get so incredibly diverse and odd during the Golden Age?
Episode: S8 E2 | 12:40
Watch • 10:45
Eons
That Time Earth was Sticky
What exactly made this time period so very, very sticky?
Episode: E1 | 10:45
Watch • 9:15
Eons
When Dinosaurs Threw Up A Mystery
How dino stomachs are revealing a mystery.
Special: 9:15
Watch • 10:47
Eons
Did Dinosaurs' Extinction Give Us Fruit?
One of the most surprising effects of the cascade of changes was...fruit?
Special: 10:47
Watch • 8:37
Eons
Why Paleontologists Can’t Stop Fighting About Spinosaurus
What does it mean to be a “semi-aquatic” dinosaur?
Special: 8:37
Watch • 12:22
Eons
The Dinosaurs Too Big To Be Dinosaurs
How did sauropods, uniquely large land animals, actually live, with their anatomy and physiology pus
Special: 12:22
Watch • 12:12
Eons
Darwin's Unexpected Final Obsession
What was Charles Darwin really obsessed with?
Episode: S7 E21 | 12:12
Watch • 12:29
Eons
Are All Oceans Basically Reincarnated?
Did you know ocean basins are reincarnated?
Episode: S7 E20 | 12:29
Watch • 8:36
Eons
Could This Sperm Whale Eat The Meg?
How did such a large predator survive?
Episode: S7 E19 | 8:36
Watch • 9:41
Eons
When Red Pandas Roamed North America
How did a relative of the red panda end up in North America?
Episode: S7 E18 | 9:41
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Watch • 12:40
Eons
The Golden Age of Sharks
Why did sharks get so incredibly diverse and odd during the Golden Age?
Episode: S8 E2 | 12:40
Watch • 10:45
Eons
That Time Earth was Sticky
What exactly made this time period so very, very sticky?
Episode: E1 | 10:45
Watch • 12:12
Eons
Darwin's Unexpected Final Obsession
What was Charles Darwin really obsessed with?
Episode: S7 E21 | 12:12
Watch • 12:29
Eons
Are All Oceans Basically Reincarnated?
Did you know ocean basins are reincarnated?
Episode: S7 E20 | 12:29
Watch • 8:36
Eons
Could This Sperm Whale Eat The Meg?
How did such a large predator survive?
Episode: S7 E19 | 8:36
Watch • 9:41
Eons
When Red Pandas Roamed North America
How did a relative of the red panda end up in North America?
Episode: S7 E18 | 9:41
Watch • 8:10
Eons
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How did the competition of spiders vs insects drive them both into the air?
Episode: S7 E17 | 8:10
Watch • 12:38
Eons
The Graveyard at the Center of the Earth
Why plate tectonics don't make sense.
Episode: S7 E16 | 12:38
Watch • 9:59
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Why Wasn't There A Second Age of Reptiles?
Why was it the mammals who triumphed?
Episode: S7 E15 | 9:59
Watch • 10:09
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How Mountains Make Evolution Weird
What do mountains reveal about primates?
Episode: S7 E14 | 10:09