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Planet Dinosaur: Ultimate Killers Page #2
- Year:
- 2012
- 50 min
- 248 Views
The feathers of this dinosaur
aren't for keeping warm, or for show.
Their structure is plainly visible
from the fossils.
They are very long, veined
and, most importantly,
their shape creates
a perfect aerodynamic surface.
And they aren't confined
to its forearms.
Its legs, too, had long feathers.
These feathers are designed
for one thing only:
flight.
Microraptor is a four-winged dinosaur
that took to the skies.
But Microraptor isn't the only
flying monster here.
Sinornithosaurus, more than capable
of stealing prey.
But it has a bigger prize in mind.
(GROANS)
And Sinornithosaurus
has a deadly secret.
In 2009, a study of Sinornithosaurus
found distinctive grooves
along the length of its teeth.
the venomous Gila monster,
to deliver venom into its victim.
The team even identified
what they thought
was the location
of the venom sack in the fossil.
It appeared Sinornithosaurus
could kill with poison.
on both its arms and legs,
Microraptor is by far the better glider.
But with no ability to gain height,
the only way is down.
Microraptor's long feathers mean
it can barely walk, much less run.
Sinornithosaurus has no such problem.
On the forest floor,
the tables are turned.
Microraptor has a fortunate escape.
Killer dinosaurs dominated
the land, the trees,
and had even taken to the air.
But by the middle of the Cretaceous
period, things were changing.
A new breed of killers was emerging.
These were the famed Tyrannosaurs.
Formidable hunter-killers that
swept aside almost all other predators.
Carnivorous dinosaurs that remained
were forced to adapt,
sometimes going to extreme lengths.
One such group was
the bizarre Therizinosaurs.
In 2009, the most complete skeleton
found so far was described.
It lived in New Mexico
(GROWLING)
These swamps are home to Zunityrannus,
a mid-sized Tyrannosaur.
And they're also home
to this weird creature,
Nothronychus.
It's actually a close relative
of the Tyrannosaur,
but with one major difference.
Nothronychus has given up eating meat.
(GROWLING)
(ROARING)
Therizinosaurs had been
a mystery for decades,
known only from tantalising fragments.
That all changed with
the discovery of Nothronychus.
It gave us our clearest look
at this strange group of dinosaurs.
It walked upright on short, stocky legs,
it had wide hips and a long neck.
these weren't the teeth of a killer.
Far from its ferocious
Tyrannosaur cousins,
this pot-bellied dinosaur
had evolved into a strict vegetarian.
But armed with viciously long claws
on its forearms,
it was by no means defenceless.
(GROWLING)
Nothronychus has easy access to food.
(GROWLS)
Nothronychus thrives here
because it doesn't compete
with the Tyrannosaurs.
But just because
you're not competing for food
doesn't mean you're not seen as food.
(GROWLING)
Over the next few million years,
Tyrannosaurs evolved,
getting bigger and more deadly.
They developed
into the ultimate predators
and dominated virtually
all of Asia and North America.
The most famous of these
might be T-Rex,
but it was just the last
in a long line of giant killers.
North America was home
to the original giant Tyrannosaur,
Daspletosaurus.
Its effectiveness as a killer
is clear from its anatomy.
It's massive, with a huge, strong skull
and a powerful, muscular neck.
Forward-facing eyes make
tracking moving prey easy.
but with these giant Tyrannosaurs,
it's all about the bite.
Daspletosaurus,
with a bite force unmatched
by any other dinosaur in the region.
This is a killer in a
completely different league.
(GROWLING)
(ROARING)
This group have congregated to
take advantage of an annual event.
A vast herd of Centrosaurus
is on the move.
Unwittingly, they're walking
In Dinosaur Provincial Park,
thousands of bones have been discovered
scattered across the same rock layer.
They belong
to the horned dinosaur Centrosaurus.
And they appear to be
the bone beds of vast killing fields,
sites of wholesale slaughter.
Seasonal monsoons drives
the Centrosaurs inland,
away from coastal flooding.
(THUNDER CLAPPING)
(ROARING)
Herding behaviour protects the many,
but at the expense of the few.
And things are about to get worse
for the Centrosaurs.
and the Daspletosaurus behind,
the stage is now set for a massacre.
But despite the rich pickings,
it's not the Daspletosaurus
that are responsible
for the scale of the slaughter.
There's an even more deadly killer
at work here.
The real killer is the weather itself.
Recent studies
of this dense bone bed indicate
that 96% of the bones
are of a single species, Centrosaurus.
And relatively few of the bones
display any bite marks.
that this was a mass drowning,
the result of widespread
seasonal flooding.
An event that we have seen repeated
in over 20 different sites.
And when the waters recede,
new opportunities emerge.
(SCREECHING)
But even in the fight for rotting flesh,
Daspletosaurus's authority is absolute.
Tyrannosaurs' domination of the globe
might have been total
had it not been for a strange quirk
in the arrangement of the continents.
the planet had a clear
north-south divide,
with no physical link between
the parts of the globe.
It meant the Tyrannosaurs couldn't
spread to the southern continents.
Here, a different type of killer
reigned supreme.
These were Abelisaurids.
In the last 10 years,
Madagascar has provided
the most comprehensive evidence
about these predators.
Madagascar was already an island.
In the Cretaceous period,
Madagascar was subject
to devastating droughts.
For big predators like Majungasaurus,
scavenging is the only way to survive.
(INSECTS BUZZING)
We thought Majungasaurus
was the top predator here.
But then in 2003,
some bones of a number of Majungasaurs
were reported gouged with teeth marks.
It appeared there was a bigger,
(SQUAWKING)
(GROWLING)
(ROARING)
A carcass will attract
every big predator for miles around.
(GROWLING)
A male Majungasaurus.
It is more than capable
of challenging for the carcass.
(ROARING)
This fight is about more than just
winning the feeding rights to a carcass.
When the bite marks
on the mauled Majungasaurus remains
were studied more closely,
the marks on the bones
were found to match
the only large carnivore in the region,
Majungasaurus itself.
This is the first irrefutable evidence
of dinosaur cannibalism.
It might seem shocking,
but it's a behaviour that clearly shows
the most successful killers
will exploit any situation
Killer dinosaurs' ability to adapt
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