Andrea Silen - National Geographic Readers: T. Rex (Level 1)

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https://lccn.loc.gov/
2021019585

https://lccn.loc
.gov/2021019586

T. rex was one of
the most powerful
dinosaurs on Earth.

You would not want to mess
with Tyrannosaurus rex
(Tye- RAN- oh- SORE- us REX).

T. rex had big teeth. It had sharp claws.
And it was as long as a bus. Yikes! Lets
meet this big, fierce (FEERSS) dinosaur.

T. rex walked on Earth millions
of years ago. It lived in parts of
North America.

Some scientists (SYE- un- tists) think
these dinosaurs lived alone. Others
think they may have lived and
hunted in groups.

T. rex lived in areas such
as present- day Montana
and Wyoming, U.S.A.

What do you call
a sleeping T. rex ?

A dino- snore .

Hunting in groups would
have made it easier to
catch a meal.

This dinosaurs body was
strong and deadly.

Each foot was longer than
a tennis racket. T. rex
walked on its toes.

T. rex s eyes worked
really well. They
helped the dinosaur
find animals to eat.

Each arm had two fingers
with claws on the ends.
Each claw was about the
length of a soda can.

Its teeth were the size
of bananas. They could
break bones in half.

The dinosaurs jaws were
super strong. Its bite could
have crushed a car.

T. rex was a carnivore (CAR- nuh- vore).
It ate other animals. T. rex was fierce,
but not fast. It probably couldnt catch
speedy animals.

T. rex may have tried
but failed to grab
fast dinosaurs like
these Struthiomimus
(Strooth- ee- oh- MY- muss).

Slow Edmontosaurus
(Ed- MON- toe- SORE- us)
was a likely meal
for T. rex .

T. rex Talk

CARNIVORE: An
animal that eats meat

But it could catch
slower plant- eating dinosaurs.
Once it did, its huge jaws opened
wide. Then its big teeth chomped
down on its meal.

T. rex used its
sharp teeth to rip
off chunks of meat.

Scientists think T. rex sometimes
tossed the meat into the air. Then
it would catch the meat in its mouth
and swallow it whole.

T. rex hunted live animals. But,
like most predators today, it also
ate dead animals it found.

Like other dinosaurs, T. rex moms
laid eggs. Scientists think the eggs
might have taken months to hatch.
T. rex parents may have guarded
their eggs to keep
them safe.

T. rex egg fossils have not
been found yet. But baby T. rex
might have hatched from eggs
that looked like this.

Scientists think T. rex
moms could have
laid about eggs
at one time!

A young T. rex grew fast. It may
have gained more than four
pounds a day over many years.

When the babies hatched, they were
the size of small turkeys. They likely
had a fluffy, feather- like covering
on parts of their bodies.

What did the baby
T. rex say after hatching?

I feel
eggs - ellent!

As they grew, they may have
lost this downy covering.
Scientists dont know if the
adults had feathers.

T. rex
could eat
pounds
of meat in
one bite.

New research suggests
that a young
T. rex likely had
a stronger bite
than an adult lion
or tiger.

Rare footprints,
likely from
T. rex, have been
discovered
in Montana and
New Mexico,
U.S.A.

T. rex
had about
to
teeth.

It snacked on
other dinosaurs like
Triceratops
(Tri- SAIR- uh- tops).

T. rex
probably
didnt roar
like in the movies.
Instead, it may
have hissed
like an alligator,
or even hooted
like a bird!

T. rex has been extinct (ik- STINKED)
for a long time. We know about the
dinosaur from fossils. Some fossils are
bones. They are
buried in rock.
Scientists dig
them up.

This T. rex fossil was found
near Fort Peck Reservoir in
Montana, U.S.A.

T. rex Talk

EXTINCT: No longer alive .
When all members of an
animal species are dead,
the species is extinct.

FOSSIL: Parts or traces of
a living thing that have
been preserved in rock