First Children Encyclopedia

. Triceratops preyed on T. rex Yes. There’s evidence that

A hip question

187

Theropods, the

meat-eaters, such

as Dilophosaurus.

Sauropodomorphs, such

as Brachiosaurus, with their

small heads and long necks.

I’m in this group!

Saurischians can be

divided into two

main groups:

Strangely enough,

scientists believe that birds

have evolved from lizard-

hipped dinosaurs – not

bird-hipped dinosaurs as

you might expect!

W

ei

rd

or^ wha

t

?

Ornithischians

These were all plant-

eaters. The swept-back

bones allowed more

room for the digestive

organs, and meant

their bellies could be

carried well back,

allowing some to walk

or run away from

danger on two legs.

Saurischians

All meat-eating

dinosaurs were lizard-

hipped, but some plant-eaters

were also lizard-hipped. T.

rex was lizard-hipped, but so

was the mighty plant-eating

Diplodocus, whom you

will meet on page 50.

Thyreophorans, the four-

footed, armour-plated

dinosaurs (e.g. Stegosaurus).

Marginocephalians, who

had heads with bony frills

or horns (e.g. Triceratops).

Ornithopods, the

two-legged plant-eaters

(e.g. Iguanodon).

I'm in that group!

Ornithischians can

be divided into three

main groups:

T. re x

Triceratops

Most lizard-hipped

dinosaurs had a pair of

hip bones that pointed

forwards or down.