Page 61 - Dinosaur (DK Eyewitness Books)

GROWING UP Fully grown frill
From left to right, fossils from four specimens
of Protoceratops (“first horned face”) show how
the skull of this sheep-sized plant-eater changed
as it grew up. The beak became tall and narrow,
the bony frill at the back of the skull enlarged,
and the cheeks flared out at the sides. Adult
males had bigger neck frills than the females.

Beak becomes longer
Frill begins Frill bone
to grow grows larger

Fully
Cheek becomes wider
developed beak
Hatchling Juvenile Immature Adult

Neck
Egg
‘TIL DEATH DO US PART Hand
A mudslide overwhelmed this Citipati while it
incubated eggs in a nest built on the ground.
As with ostriches, this parent would have
been a male, and several females might
have laid the eggs in its care. This
particular Citipati died with its
feathered arms spread like a
bird’s wings to shield the
eggs from the weather.
Citipati was an oviraptorid
that lived late in the
Cretaceous Period in
what is now Mongolia’s
Gobi Desert.

Fossilized
Citipati
with eggs

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