probably no other creatures on the
planet
have struck as much fear and on our
[Music]
the earliest dinosaurs appeared about
245 million years ago during the
Triassic period when most of the Earth’s
landmasses were still joined together as
the supercontinent Pangea over millions
of years Pangaea split apart causing the
dinosaurs to become separated for the
very first time thus led the reptiles to
adapt to their specific habitats and
diversify giving rise to many new
dinosaur species according to some
estimates more than 1,000 species of
dinosaurs have roamed the earth
all dinosaurs descended from reptiles
called ARCA soars from there
dinosaurs branched out into two major
groups Soros Kia and onethis Kia based
on the shape and orientation of their
pelvis in sir whisky and dinosaurs such
as Tyrannosaurus Rex and Brachiosaurus
the pelvises pubis bone faces forward
and down in onethis qian dinosaurs such
as Stegosaurus and hadrosaurs the pubis
bone faces backward and down across both
groups dinosaurs varied greatly in size
some were small like Compsognathus which
was barely larger than a chicken whereas
others were gigantic like dreadnought us
which was 85 feet long and weighed 65
tons making it the largest land animal
dinosaur diets buried as well herbivores
like hadrosaurs evolved to have
specialized teeth for grinding tough
plant material carnivores made up
roughly 40% of dinosaur species some
predators like the Raptor Deinonychus
even hunted impacts social behaviors
were also found in other dinosaurs
footprints and trackways indicate that
some of the ancient reptiles traveled
together evidence also shows that herds
may have made annual visits to certain
sites to lay their eggs but by around 66
million years ago most dinosaurs died
out and the reason why is still a
mystery the most well-known explanation
is an asteroid strike but a multitude of
factors may have contributed to this
extinction in fact the dinosaur
population was already in severe decline
by the time the asteroid struck however
several dinosaur species survived and
some of which evolved to become today’s
the world has never again seen land
creatures as great as the dinosaurs but
through their descendants and fossils left behind their legacy lives on
planet
have struck as much fear and on our
[Music]
the earliest dinosaurs appeared about
245 million years ago during the
Triassic period when most of the Earth’s
landmasses were still joined together as
the supercontinent Pangea over millions
of years Pangaea split apart causing the
dinosaurs to become separated for the
very first time thus led the reptiles to
adapt to their specific habitats and
diversify giving rise to many new
dinosaur species according to some
estimates more than 1,000 species of
dinosaurs have roamed the earth
all dinosaurs descended from reptiles
called ARCA soars from there
dinosaurs branched out into two major
groups Soros Kia and onethis Kia based
on the shape and orientation of their
pelvis in sir whisky and dinosaurs such
as Tyrannosaurus Rex and Brachiosaurus
the pelvises pubis bone faces forward
and down in onethis qian dinosaurs such
as Stegosaurus and hadrosaurs the pubis
bone faces backward and down across both
groups dinosaurs varied greatly in size
some were small like Compsognathus which
was barely larger than a chicken whereas
others were gigantic like dreadnought us
which was 85 feet long and weighed 65
tons making it the largest land animal
dinosaur diets buried as well herbivores
like hadrosaurs evolved to have
specialized teeth for grinding tough
plant material carnivores made up
roughly 40% of dinosaur species some
predators like the Raptor Deinonychus
even hunted impacts social behaviors
were also found in other dinosaurs
footprints and trackways indicate that
some of the ancient reptiles traveled
together evidence also shows that herds
may have made annual visits to certain
sites to lay their eggs but by around 66
million years ago most dinosaurs died
out and the reason why is still a
mystery the most well-known explanation
is an asteroid strike but a multitude of
factors may have contributed to this
extinction in fact the dinosaur
population was already in severe decline
by the time the asteroid struck however
several dinosaur species survived and
some of which evolved to become today’s
the world has never again seen land
creatures as great as the dinosaurs but
through their descendants and fossils left behind their legacy lives on
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