Albertosaurus
Albertosaurus (al-bert-oh-saw-rus) is a smaller member of the Tyrannosaurid family and averaged 29 feet long.  It may have been capable of running quickly over short distances in pursuit of prey.  It had a sharply clawed hind foot, probably for kicking at close quarters.  Large serrated teeth also contributed to make it a very efficient predator.  Its favorite prey were probably the duckbilled dinosaurs.
Animantarx
Animantarx ramaljonesi is a small armored nodosaur dinosaur which lived during the Early Cretaceous period 97 million years ago.  Animantarx is Latin for Living Fortress.
Chasmosaurus
Chasmosaurus is the earliest of the long frilled ceratopsians.  It was also the smallest.  The Chasmosaurus used their crests as a shield, and they may have formed a circle to protect their flanks and young from predators.
Ichthyosaurus

Ichthyosaurus (IK-thee-oh-SAWR-us) was a marine reptile; it was not a dinosaur.  this sleek animal could perhaps swim at speeds up to 25 mph.  It lived from the early Jurassic period until the early Cretaceous period, roughly 206 to 140 million years ago.

Plesiosaurus
Plesiosaurus was one of the largest aquatic animals and lived throughout the Cretaceous period. It grew up to twenty three meters long.  The plesiosaurus had very strong jaws, and ate squid like animals along with giant mollusks. It was one of the (if not the) largest aquatic carnivores.  It was not a dinosaur, it was a Sauropterygian.
Tyrannosaurus Rex
Tyrannosaurus rex was one of the largest land carnivores of all time.  The largest knownT. rex skulls measure up to 5 feet in length.  The skull was extremely wide at the rear but had a narrow snout, alllowing unusually good binocular vision.
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