NATIONAL GEOGRAPHIC
VIDEO HOME
NAT GEO TV
NAT GEO WILD
KIDS
MORE VIDEOS
Adventure
Animals
Environment
History & Civilization
Nat Geo Exclusives
People & Culture
Photography
Science & Space
Technology
Travel
Cosmos: A Spacetime Odyssey
A Knockout Punch
Learn how the earth became the planet of the mammals after the Cretaceous and what impact it had.
more
X
Cosmos: A Spacetime Odyssey
A Knockout Punch
Learn how the earth became the planet of the mammals after the Cretaceous and what impact it had.
X
Cosmos: A Spacetime Odyssey
A Knockout Punch
Learn how the earth became the planet of the mammals after the Cretaceous and what impact it had.
Share Link
Featured Videos
Related
A World Without Sunlight
Born In Litters
Inside Look
Pickering's Computers
Halley's Comet
Ice, Rock and Space
The Halls of Extinction
President Obama's COSMOS Introduction
The Songs of Whales
Comets Through the Ages
A Nuclear Reality
Star-Spotting in Bensonhurst
The Cosmic Calendar
Cosmos Host Profile: Neil deGrasse Tyson
Cosmos: A Spacetime Odyssey Preview
Newest
All
Category:
Adventure
Animals
Environment
History & Civilization
Nat Geo Exclusives
People & Culture
Photography
Science & Space
Technology
Travel
Partner Content
A very different kind of hydropower
04:38
Environment
These peatlands could be critical to fighting climate change
02:49
Partner Content
Sustainable technology built sustainably
04:37
Animals
Shark tagged from submarine for first time in history
02:04
Science
Science fiction inspires the future of science. Here’s how.
12:53
Animals
Inside the surprisingly social lives of manta rays
01:41
Environment
Amazon fires 'so much worse than before' say locals
01:57
Culture & History
These divers search for slave ship wrecks and discover their ancestors
18:06
101 Videos
Tornadoes 101
05:31
Animals
What a sea snail die-off means for Californians—and the climate
11:06
Culture & History
Nat Geo's Aaron Huey's most epic photos
10:17
Animals
See why this colorful ‘king of birds’ is the center of conservation efforts
09:29
Exploration & Adventure
Watch this man brave an icy plunge in the Arctic.
01:11
Animals
See how this school of tiny fish uses bacteria to glow in the dark
03:13
The Story of Plastic
What's the world's most littered plastic item? Cigarette butts
05:05
Animals
Behind the scenes: A rumor about opiates and pangolin scales is debunked
05:07
Show More Videos
