00:15In the depths of space, a threat is looming.
00:22Trapped between the orbits of Jupiter and Mars,
00:28the asteroid belt.
00:32One and a half million chunks of ancient rock circling the Sun,
00:43drifting endlessly.
00:55But in a single moment of pure chance,
01:04one asteroid is thrown out of its orbit.
01:10A fleeting instant, millions of kilometers from Earth,
01:16sends it on a new trajectory towards the very center of our solar system.
01:34But its journey will come to a sudden and violent end,
01:41in one of the most catastrophic events in Earth's history.
01:50And the final chapter in the epic story of the dinosaurs.
02:01So, Oh, I'm so young.
02:27The What You Can Do
02:28The What You Can Do
04:00Hundreds of tropical islands and opportunity.
04:19But these islands are no paradise.
04:26They are home to a formidable predator.
04:34One of the fastest, most agile dinosaurs of its kind.
04:43North America's answer to the Spinosaurus.
05:00Just not in the way you would think.
05:02Not even remotely.
05:08This is Hesperonis.
05:12He is formidable.
05:15And he is fast.
05:19But he's pretty much the opposite of his giant terrifying cousins.
05:35He's awkward.
05:37And clumsy.
05:41And has tiny teeth.
05:44Not exactly the traits of a ferocious hunter.
05:50But what he does share with Spinosaurus is that he's not confined to dry land.
06:04In fact, he's the most advanced aquatic dinosaur in history.
06:17Like some sort of prehistoric penguin.
06:22He's able to swim far out the sea to access feeding grounds that were previously out of reach.
06:51This is the bounty of his new blue realm.
07:05Down here, his big clumsy feet become powerful propellers.
07:14And his 94 needle sharp teeth snatch fish with ease.
07:38But as an air breather, he's still tied to the surface.
07:56And the surface is not a safe place to linger.
08:03Because below, there are beasts.
08:09Twice the size of a killer whale.
08:12hinxes fled from the dry line.
08:20Hum�usaasa.
08:28They 빠 1500 BC.
08:29The afects predators of these seas.
08:33The afects predators of the seas.
08:42Hesperonis must get back to the shore, but the Mosasaur moves with frightening speed.
08:56Luckily, Hesperonis is much more agile, but he's exhausted, which gives the Mosasaur one last shot.
09:36Hesperonis is a true survivor, venturing further into the ocean than any dinosaur ever has.
09:49But these waters are treacherous, even for the best swimmers.
10:02Despite the dinosaur's success in the shadows, the Mosasaurs rule the waves.
10:19800 miles north, on land, it's a different story.
10:37Furelled by a warm, stable climate, the dinosaur's dominance here is unrivaled.
10:53The great sauropods are thriving among the tall trees, as they have since the dawn of the Jurassic.
11:08But down below, there has been a revolution.
11:18A female handersaw.
11:24While she may be dwarfed in present company, she's actually larger than an elephant.
11:34And she won't be held up by these giants, because nothing can stop a mother on a mission.
11:45And that mission is to feed her family, who are somewhere down there.
12:07Long ago, their cheek-stuffing ancestors were scarce and scattered.
12:16Their food was on, as we live.
12:17But, Adrosaurs are now so successful, their herds are thousands strong.
12:26The greatest gathering of dinosaurs, the world has ever known.
12:33But this female's family isn't traveling with the herd.
12:40They're in the safety of the creche,
12:43a sprawling nursery for hundreds of young hadrosaurs,
12:51including her own.
12:58At six months old,
13:00they have insatiable appetites
13:04and will eat almost anything she brings them.
13:11Anything.
13:24Feeding in this bird-like way takes a lot of refills.
13:30So, she's constantly leaving to go find food.
13:36And when moms are away,
13:39little ones will play.
14:05With the wingspan of a fighter jet,
14:08pterosaurs are now bigger than ever.
14:15And creches are the perfect hunting crowns,
14:19where unguarded nests are the easiest pickings.
14:46The Mothers will defend their babies at all costs.
15:06The giant pterosaur is determined to feed.
15:19The screams from the nest are like a dinner bell to the predator.
15:40little ones aren't just crying in fear.
15:45They're calling for help.
15:47the head of the dead.
16:06This fierce instinct to protect their young is central to the hadrosaurs' remarkable success.
16:18but other dinosaurs are taking defense to a whole new level
16:25because the arms race between predator and prey is escalating
16:33and this will give rise to the most iconic dinosaurs of all time
16:45this will take so long that the continent of north america will shift
16:53the land buckling up into the sky
17:06the rocky mountains
17:10it's here in the foothills below
17:15that the dinosaurs are making an impact
17:28pachycephalosaurus
17:31using their outrageously thick skulls
17:37to do them for supremacy
17:46and alongside them
17:48a dinosaur with even more impressive headgear
18:00triceratops
18:01triceratops
18:01triceratops
18:22triceratops
18:32and pachycephalosaurus
18:35have impressive weapons
18:40yet there are some here
18:43that are even more armed and dangerous
18:58under the cover of darkness
19:00under the cover of darkness
19:01the latest and greatest of the armored warriors
19:06six meters long
19:09and highly territorial
19:14and
19:15ankylosaurus
19:26He's on patrol for intruders, bold enough to breach his borders.
19:42His tank-like torso is covered in dozens of thick, bony plates.
19:54And what's more, he has a powerful new weapon.
20:04A club-like tail, weighing half a ton, that he can use to take on whatever stalks these forests.
20:20He senses something.
20:51His borders have been breached by the worst possible intruder of all.
21:11A Tyrannosaurus Rex.
21:14A Tyrannosaurus Rex.
21:37A Tyrannosaurus Rex.
21:44Here we go.
22:41Ankylosaurus versus T-Rex.
22:53An evolutionary stalemate.
22:56Millions of the years in the making.
23:19But in this arms race, there's one thing that does set these dinosaurs apart.
23:30Intelligence.
23:32Intelligence.
23:33Intelligence.
23:33Intelligence.
23:35Dying.
23:35Dying.
23:38Dying.
23:42Dying.
23:51Dying.
23:53Dying.
23:53Dying.
23:54Dying.
24:14T-rex is one of the most fearsome predators of all time.
24:22And to remain at the top of her game, she must eat the equivalent of 200 steaks every day.
24:35And yet, so far, she hasn't eaten a single bite.
24:43That's because she has special plans for this takeout meal.
24:53But ankylosaurus is no light snack.
25:05Six tons of muscle and bone with an assortment of lumps and bumps.
25:25Even for T-rex, it's quite a drag.
25:29T-rex, it's quite a drag.
25:37Let's go.
26:05Finally, her journey's end.
26:17And the reason she's gone through all this effort.
26:34Five hungry hatchlings.
26:50A ferocious killer?
26:53Yes.
26:54But also, a devoted mother.
27:16She will ensure her little ones are well fed.
27:25To give them the very best start in life.
27:33Something their distant ancestors could only dream of.
27:42Far back in the Triassic, tiny Marasuchus hatched into hell.
27:50These dinosaurs in the making.
27:53Forced to live in the shadows.
27:57Hiding from the ruling reptiles.
28:03But when fate intervened.
28:07They turned catastrophe.
28:11Into opportunity.
28:15And began their monumental rise.
28:21Growing bigger.
28:24Stronger.
28:24And ever more formidable.
28:33In time.
28:36They would triumph.
28:38Not just on land.
28:40But in the sea.
28:43And the sky.
28:47After 160 million years.
28:51The dinosaurs are now so dominant.
28:56Nothing on earth.
28:58Can stand in their way.
29:06But something not of this earth.
29:10Will.
29:12Because as this family's journey.
29:15Is just getting started.
29:18Another journey.
29:20Is approaching its end.
29:27The asteroid now hurtling towards earth.
29:32At 50 times the speed of sound.
29:35Will finally.
29:37Have its date with destiny.
29:41The asteroid now hurtling towards earth.
29:47At 50 times the speed of sound.
30:12It smashes into the ocean.
30:15off the coast of Mexico
30:18with the power
30:20of a billion atomic bombs.
30:24Temperatures are hot enough
30:26to vaporize the seabed.
30:30Along with every living thing
30:32for hundreds of kilometers.
30:44Far away in the foothills
30:46of the Rockies
30:47these great dinosaurs
30:50have no idea
30:52what's about to hit them.
31:16The largest earthquakes
31:18in history.
31:28But the worst is yet to come.
31:35An enormous wall
31:37of superheated debris
31:38explodes outward.
31:58The dinosaurs
32:00caught beneath this death cloud
32:02are entombed.
32:07The air world is so hot
32:10it literally bursts into flames.
32:21Even the toughest armor
32:23is no protection.
32:35The cloud quickly engulfs
32:38the entire planet
32:40suffocating it with ash
32:44shrouding it in darkness.
32:46appears.
32:47When the air isastic,
32:47I don't know.
33:32The few still standing at the end of the day are in a nightmare, choking in the gloom.
34:00The end of the day is the end of the day.
34:22The end of the day is the end of the day.
34:47Starved of the sun's rays, an impact winter descends on the Earth.
35:00Global temperature is dropped by 25 degrees Celsius.
35:08Conditions too cold for almost any dinosaur to withstand.
35:27Giant sauropods laid to rest in the cinders of the buried trees that made them so tall.
35:52In their crowded colonies, those who lived together died together.
36:08Protective mothers cannot shield their young from their freezing temperatures.
36:20The punishing cold has also taken its toll on the most famous dinosaur of all.
36:36The tyrant king has fallen.
37:01Even the mighty tyrannosaurus rex will not survive this.
37:09It is.
37:10I don't know.
37:40The reign of the dinosaurs has finally come to an end.
38:16But 66 million years later, the dinosaurs are rising again.
38:30This time, at our hands.
38:41Today, their fossils stand as monuments to a lost world.
38:48But more than that, they are the keys that unlock the secrets of the dinosaur story.
38:59Today, our understanding of their lives is now greater than ever.
39:05From their very first moments to their very last.
39:14And the revelation that on Earth's darkest day, not all dinosaurs died.
39:24Some were small enough to find shelter from the apocalypse.
39:33And survive even to this day.
39:40The flying dinosaurs we now call the birds.
39:50And the clues to their past are hiding in plain sight.
40:17The remarkable journey that started 235 million years ago continues.
40:27Alongside us.
40:31They are the last remaining link.
40:35To a long lost kingdom.
40:40That was the age of the dinosaurs.
40:46Of course.
40:47The land of the dinosaurs.
40:54The land of the
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