First Children's Encyclopedia by Dorling Kindersley - page 187

Meat-eaters had
sharp claws.
No. They are related, but the two groups are different.
What is a dinosaur?
Clue in the claws
Meat-eating dinosaurs were
known as theropods, which
means “beast-footed”, because
they had sharp, hooked claws
on their toes. Plant-eating
dinosaurs tended to have
blunt hooves
or toenails.
Walking tall
Dinosaurs
walked on
their toes
with their legs
directly under
their bodies.
Egg layers
All dinosaurs
laid eggs – some
in nests, just as birds do today.
The baby developed in the egg until
it was ready to hatch. About 40 kinds
of dinosaur eggs have been discovered.
Skull holes
Dinosaur
skulls had
large holes,
or “windows”. These made them
lighter, which was necessary
as some of the largest skulls
were almost as long as a car.
Plant-eaters
had blunt
toenails.
Dinosaurs
walked
on upright,
pillar-like legs.
Crocodiles
stand
with their knees
and elbows
slightly bent.
Lizards
sprawl,
with their knees
and elbows held
at right angles
to their bodies.
Giganotosaurus
skulls
had huge “windows”.
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