Stegosaurus

Stegosaurus has two rows of bony plates on it's back head to tail.  He weighs five tons and was 30 feet long.  An adult African elephant weighs 6 to 8 tons.  Stegosaurus had a small skull and the spikes at the end of it tail were longer than it's skull.  His tail spikes were 3 feet long.

Kentrosaurus

Kentrosaurus was found in Tanzania, which is in Africa.  Kentrosaurus is like a Stegosaurus but half of it is plates and the other half is spikes.  Stegosaurus was all plates and Kentrosaurus also has a spike on each shoulder.  He was about an inch taller than a human and his beak wasn't as big as Triceratops'.
 

Einiosaurus

Einiosaurus is kind of like Triceratops but he has two big horns on his frill and a bigger, curved horn on his nose. He is smaller, too.  He is very weird looking and his legs are very strong looking.  His horn that curves is for defense, display, and attack.  He has a beak but Triceratops' beak curves at the end and his doesn't.

 

Triceratops

Triceratops means three horned face.  He has two long horns above his eyes and one small one on top of his nose.  He has a frill on top of his head and a tail about as long as his body.  Robert Bakker (a really neat paleontologist in a lot of the dinosaur shows) thinks Triceratops is the most dangerous dinosaur but I think it is Ankylosaurus.

Spinosaurus

Now Spinosaurus.  Spinosaurus is a big Irritator and has three claws on each hand.  Spinosaurus also has a bigger spine and not the same-looking skull.  He is the biggest carnivore and that means T. Rex wasn't the biggest meat eater out there.  His teeth were 6-10 inches long.

Here is a description of how Spinosaurus killed it's prey from Monsters Resurrected


This is a real Spinosaurus tooth I got for my birthday!

Ichthyornis

This is Ichthyornis.  Ichthyornis is just 12 inches long.  He is like a bird, but has a beak with teeth and webbed feet to swim.  He also has claws on his toes, has feathers, and has a pointy beak.  It lived during the Mesozoic era and was one of the birds that bridged the gap between Archaeopteryx and modern birds.

Irritator

This is Irritator.  They call him Irritator because when they found his bones, they thought it was a Pteranodon because someone had previously modified to look like a Pteranodon.  The scientists were irritated because they were tricked.  Irritator was and is basically a small Spinosaurus with a smaller spine.  It was 26 feet long.  It lived in the early Cretaceous and was a theropod.  It was found in Brazil, which is not very common at all.