Prehistoric Planet (2022) s02e02 Episode Script

Dinosaurs ruled the planet
for over 150 million years.
They occupied almost every corner
of the globe
and came in almost
every shape and size imaginable.
Some were truly extraordinary.
We now know that T. rex was
a powerful swimmer,
Velociraptors were cunning,
feathered hunters,
and that some dinosaurs had
the most bizarre behavior.
But new discoveries
are being made almost every day
that tell us more about life
on this planet 66 million years ago.
This time on Prehistoric Planet,
and new insight
into their quest to find a partner,
and their titanic battles.
Journey to a time
when nature put on its greatest show.
This is Prehistoric Planet 2.
This is the largest expanse of lava
to flood the earth for 100 million years.
The Deccan in central India,
a hellish place
and certainly not where
you would expect to find dinosaurs.
And yet,
giants risk their lives traveling here.
Isisaurs.
And all are females.
Lava has been flowing in the Deccan
for so long
that in places, it is a mile thick.
Every spring, females leave
the safety of their forest home
to make a perilous journey
into these badlands.
They can pick a safe route
but there are other dangers here.
In addition to the steam, a deadly mixture
of carbon dioxide and hydrogen sulfide
spews from volcanic vents.
In the cool pre-dawn air,
these heavy gases sink
to create a barely visible,
suffocating blanket.
Just a few lungfuls can kill.
But isisaurs have one crucial advantage.
Their long necks can keep their heads
above this blanket of poisonous fumes.
But ahead lies a place
where this will be hard to do.
They're entering a low-lying area
where the deadly gases
are particularly thick.
And for these females,
something is already wrong.
And worse,
as the sun rises and warms the air,
the gases swirl even higher.
Long necks can no longer protect the herd.
They must escape to higher ground
and quickly.
The climb is steep
but should bring fresher air.
Relief at last.
And ahead, their final destination.
A volcanic island in the sky
rising high above
these treacherous badlands.
The huge crater, a caldera,
provides a safe communal nesting ground.
The surrounding sea of poisonous gases
and the inbuilt geothermal heating
makes it an ideal incubator.
Each mother digs a seven-foot trench
in the warm sand
to hold over 20 melon-sized eggs.
The eggs are safe in the caldera for now,
but this is just the beginning
of their story.
In a few months,
hundreds of tiny babies
will hatch to face this desolate world.
If any are to survive,
they'll need
a perfectly timed change in conditions.
The badlands of the prehistoric planet
tests even dinosaurs to their limits.
This strange landscape
carved by scouring winds
and vast ancient rivers
might appear empty of life.
But here in Asia,
is a new family of Velociraptors.
The young are just a few weeks old.
It might seem that in such a barren place,
they face an uncertain future.
Their survival relies on a strange event,
not here, but miles from their home.
Across the baking desert lies a forest
trapped in a sea of sand.
A change in the seasons
brings rare water to this region.
Huge stands of poplar trees
mark its arrival
with a flush of nutritious leaves.
A magnet that draws many hungry animals.
Long necked nemegtosaurs
and with them, much smaller Prenocephale.
But one thing stands in their way.
This immense plateau.
And the only way to reach the forest
is through this maze of canyons.
As they enter, the herd becomes nervous.
It's a good place for an ambush.
The Velociraptors are waiting.
But they can't possibly
tackle a titanosaur.
Success will depend instead
on other hunters on the prowl.
Tarbosaurs.
Asia's version of Tyrannosaurus rex.
As the predators approach, panic spreads.
Only the Prenocephale can escape
to higher ground.
And this
is what the Velociraptors have waited for.
Now, the Velociraptors can finally
spring their ambush.
At last.
Working together, they have secured a meal
for the whole family.
The tarbosaurs have also had success.
For predators, it's actually a time
of plenty.
And for the Velociraptors,
the perfect time to start a family.
Having clever, caring parents
can give youngsters an excellent start.
And here in the badlands of Asia,
there are few more
dedicated dinosaur parents than these.
A colony of nesting Corythoraptors.
A few days ago, females laid eggs
on these circular mounds.
But the job of brooding them falls
to the males.
And that is not easy.
Exposed to the midday sun,
the eggs would soon cook.
But the fathers use their broad tail
and forearm feathers
to keep the nest shaded.
And pay a heavy price.
Enduring hour after hour
in the searing heat.
At last, in the cool of the evening,
the males can step away in search of food.
This is when nesting
in a colony brings benefits.
Instead of all leaving at once,
the Corythoraptors take turns.
So, there's always a neighbor
keeping an eye out for danger.
But even this neighborhood watch
can't guarantee their safety.
A female Kuru kulla,
a relative of Velociraptors.
She is extremely hungry but wary
of the Corythoraptors' powerful beaks
and claws.
But she has one key advantage.
Her night vision is better
than that of the owners of the nests.
If she's quiet,
she can sneak into the colony undetected.
She picks her target carefully.
This is her chance.
But not to attack.
This predator is also a thief.
She will eat as many eggs
as fast as she can.
Time's up. She's been discovered.
One last egg to take away.
She now has a chance
to enjoy her stolen egg in peace.
But this thief shares her spoils.
With these purring sounds,
she calls her young.
Her chicks are not long
out of the nest themselves.
They need to learn
that this strange new object is food.
And discover how to break into it.
Maybe their beak or perhaps a claw.
Success, perhaps more by luck than skill.
But still a vital lesson
for this next generation of egg thieves.
In the badlands,
the relief of cooler nights
is all too soon followed by the return
of the intense heat of the sun's rays.
The temperature on the surface of the sand
can soar to over 160 degrees Fahrenheit.
Any water here soaks away
or evaporates in seconds.
This is one of the driest places on earth.
Without water, no animal can survive.
Yet this is home to these young Tarchia.
They are desert-living ankylosaurs.
Heavily armored with huge, clubbed tails.
Dark patches protect the Tarchia's eyes
from the glaring sun.
And this is the sound
of Tarchia's very own
air conditioning system.
Their large nose cools the air
as it leaves the body,
condensing and so conserving
valuable water with every breath.
It allows them to survive long periods
without drinking
as they search for a meal.
The high temperatures here
create scouring winds
which carve the rocks
into extraordinary shapes.
But they also strip the ground of soil.
Some plants, however, manage to take root
in cracks between the rocks.
Any meager mouthful
is worth competing for.
With every minute, the sun climbs higher.
Soon, all shade will be gone.
And even these masters
of the desert welcome a drink sometimes.
Like many nomads,
the Tarchia have a mental map
of the desert
and can travel across empty landscapes
with unerring accuracy.
They remember the rare places
where there are natural springs.
Desert oases like this one.
A lifesaver for animals
that can find them.
Prenocephale.
but a display of strength
can prevent a dangerous battle.
In the end, the Prenocephale
are little more than annoying.
But an adult Tarchia is another matter.
Especially one
almost twice the youngster's weight.
It wields a club
weighing almost 50 pounds.
If this comes to a fight,
the juvenile can't win.
But reinforcements are on the way.
The pair are reunited.
Now there are twice as many swinging clubs
for the adult to deal with.
He decides that perhaps there
is enough water here
for everyone to share.
The young Tarchia can finally drink
in peace.
But they may not be able
to enjoy their rest for long.
In badlands, conditions can change
with astonishing speed.
Rising summer temperatures
fuel electric storms
hundreds of miles wide.
Here in the Deccan, these seasonal storms
cause a shift in the wind direction.
And around the caldera
where the isisaur females
laid their eggs months ago,
the poisonous gases have now blown away,
providing a critical window
of opportunity.
There are strange sounds coming
from beneath the sand.
Baby isisaurs are calling to each other
from inside their eggs.
It helps to synchronize their hatching.
The babies are relatively tiny,
less than a foot long.
There's nothing to eat
except their mothers' dung.
Surprisingly,
it's very nutritious and important
to the hatchlings in other ways too.
It introduces healthy bacteria
into their guts,
and it also contains pheromones that,
like smells,
will enable them
to find their mothers' herd.
It will lead them
to the safety of the forest.
But the journey isn't easy.
The winds may have changed in their favor,
but many dangers lie ahead
for the young isisaurs.
Hot springs and bubbling pools
of liquid mud.
A deadly trap.
After two days of trekking,
but their mothers have come
to the rescue again.
Small plants have taken root
in the cracked lava,
sprouting from seeds
dropped in the mothers' dung.
But a new danger is heading their way.
Now the wind has cleared the toxic gases,
the door opens for predators.
A rajasaur.
With so many babies out in the open,
this could be a feast.
Cracks in the lava
are the only possible hiding place.
More rajasaurs arrive.
Despite the dangers, hundreds of babies
succeed in reaching the forest.
Here, they will live together hidden
in the undergrowth for several years.
Until finally
they are big enough
to join their mothers' herds.
With luck, the females among them
will return to this crater
in years to come to lay eggs of their own.
Like many animals that live
in such inhospitable places,
the risks will be high.
But there are also great opportunities
in the badlands of the prehistoric planet.
This is the fossilized egg
of a giant dinosaur.
A titanosaur.
When freshly laid,
it would have weighed
around a kilo and a half,
and its shell
is about two millimeters thick.
While the eggs certainly were tough,
they still needed
to be kept safe and warm.
So how did dinosaurs take care
of their eggs?
In order to protect their eggs
from predators
and to keep their eggs warm,
dinosaurs evolved a list of strategies.
One of these strategies was
to build a nest
and then to actually
sit on top of the nest.
We know for certain dinosaurs did this
because we actually have fossils
of dinosaurs sat on top of nests.
Eggs found in these nests
contain tiny babies of the same species
as the adults,
providing the first evidence
that some dinosaurs
looked after their young.
But although this offered protection
and shelter from the elements,
there was a downside
to incubating eggs in this way.
Having to sit on an egg
and actually look after it means
that you are committed
to the care of that egg
for the entire duration
of their development
up until the point of hatching.
For some dinosaurs,
it was a commitment worth making.
But others, like sauropods,
faced a different challenge.
It's likely that some dinosaurs
never sat on their eggs.
After all, many of these animals
weighed tons and tons
and would have crushed them
before they had any chance of hatching.
So, what was their solution?
There are some sauropod egg clutches
where the female excavated a long trench
with her back feet.
She then backfilled the trench
once she had laid all the eggs.
This behavior can be seen today.
Turtles bury their eggs to protect them
from predators,
and the sun-warmed sand
keeps them at the ideal temperature.
But some dinosaurs had another trick
to keep their eggs warm.
We think some dinosaur groups
deliberately collected
and piled up rotting vegetation.
They basically formed a compost heap
on top of their egg-filled nests.
Bush turkeys in Australia
use this remarkable technique.
As the vegetation breaks down,
it releases enough heat
to incubate their eggs
for around seven weeks.
But it was a discovery in 2010
that revealed that some dinosaurs
had an even more unusual way
of keeping their eggs warm.
They use heat from the earth itself.
In one particular site in Argentina
that's had lots
of sauropod egg discoveries,
it's right next door
to some geothermal springs.
We're thinking the sauropods
were using that volcanic activity
to help keep its eggs warm.
Another location,
the Deccan region of India,
one of the most volcanic areas
during the late Cretaceous,
provides more evidence.
There are many, many layers of lava,
then in between the lava flows,
we find dinosaur eggs.
Dinosaurs were coming to this location
even when it was highly active
volcanically,
using it as a nesting site
for literally centuries.
Dinosaurs had many ways
but we can be certain of one thing.
Their methods worked very effectively,
helping them to rule the world
for over 150 million years.