Dinosaurs lived millions of years ago, before there were any people on Earth.

T. rex
Meet tyrannosaurus rex.

T. rex was a huge meat-eating dinosaur.  It  walked on two powerful legs.
This meat-eater had a huge head with large, pointed, teeth and strong  jaw muscles.


                          T. rex skullWatch out for those jaws!  T. rex may have had teeth that were each 13 inches long, and it could eat up to 500 pounds of meat and bones in one bite!

It had tiny arms, each with two fingers. 
 Its body was solidly built but its bones were hollow. 
Tyrannosaurus rex was up to 40 feet  long and it may have weighed  7 tons!
It walked on its toes, so it left small footprints even though
each foot was more than a yard long!
And here is an amazing fact....
T. rex had a stride length that was almost 15 feet long!

Dinosaurs were reptiles.
 Most hatched from eggs.
No dinosaurs could fly.
None lived in the water.

Meet brachiosaurus.

Brachiosaurus was one of the tallest and largest dinosaurs. 
It had a long neck and a small head.
Brachiosaurus walked on four legs. 
But  its front legs were longer than its hind (back) legs. 
It was very tall,  up to 50 feet!  It was 85 feet long.
Brachiosaurus was about 85 feet  long and weighed up to 88 tons! 
It was a herbivore, a plant eater.
It probably ate the tops of tall trees.
It swallowed its food whole, without chewing it.

But even though these animals were the largest animals to ever walk the Earth....


...meet the blue whale, the largest animal ever to live on Earth.

The largest dinosaurs were over 100 feet long and up to 50 feet  tall. 
The smallest dinosaurs  were about the size of a chicken.


Meet triceratops.

Triceratops was a like a rhinoceros. 
It walked on four strong legs and had three horns on its face. 
One short horn was above its parrot-like beak
and two longer horns were above its eyes.
It had a large skull, up to 10 feet long, and its body was about 30 feet long!  This big fellow hatched from eggs.  He grew to be almost 12 tons!

Meet apatosaurus.

Apatosaurus (which used to be known as Brontosaurus) was one of the largest
land animals that ever existed.
It measured about 90 feet long!
 It weighed 38 tons.
Its head was less than 2 feet long; it had a very tiny brain.
This plant-eater had a long neck and tail.
Its hind legs were larger than the front legs.


Sort these animals first in ABC order, then by  length, and then by weight.