#RHINOCEROS DINOSAUR FREE#

This dinosaur is known for having sharp front claws and feathered front legs. It roamed what is now the western interior of North America and central Mongolia in the early Cretaceous period. The Deinonychus was first discovered in southern Montana in 1964 when over one thousand bones were recovered.

#RHINOCEROS DINOSAUR FREE#

RELATED: Want to have fun and learn more about the types of dinosaurs?! Why not grab a free copy of our dinosaur coloring book. They are known as flying reptiles, and are the earliest known vertebrates to fly. Pterosaur translates from Greek into “wing lizard”.Ornithischia is the major group of dinosaurs that directly translates to “bird-hipped”, and they are classified due to their hip anatomy.They are one of two major divisions, the other one being Ornithischians. Saurischian dinosaurs are “reptile-hipped” species and are classified by their hip structure.**There are three major types of species: They are known for having bony body armor lined in rows on their bodies. Thyreophorans are known as armored dinosaurs and include the Ankylosaurus and Stegosaurus.They are known for the horns on their faces and frills behind their heads. A family of Cerapod dinosaurs that includes Triceratops, Centrosaurus, and Styracosaurus.They are classified under the clade Ornithischia. Cerapods contain the species that were herbivorous and did not have long necks.They typically walk on two legs and can be nearly any size. *There are four major orders of dinosaurs: During this extinction, about 60% of species on Earth went extinct. The drastic impact and change in climate caused the mass extinction event known as the K-T extinction. This asteroid is located off the coast of Mexico and is 93 miles wide and 12 miles deep. The most common and widely accepted theory revolves around an asteroid ( Chicxulub impactor) that struck the Earth around the end of the Mesozoic Era, when the dinosaurs went extinct. This proposed theory began the idea that they died of a mass extinction event. In 1980 several scientists at the University of California at Berkeley proposed the “K-T extinction”. Several ideas have been debated over the last few decades.

Since most kinds of dinosaurs were so massive, people question why they were wiped out so quickly? This is why dinosaur skeletons have been discovered all around the world.ĭinosaurs are known to have gone extinct at the end of the Mesozoic Era because fossils appear in rock layers of this Era, but not in the next Era. It continually broke and drifted apart until it formed the separate continents and land masses we know today. Throughout the Era, Pangaea started to break up into pieces.

The dinosaurs lived everywhere in the world, but their world did not look like ours.Īt the beginning of the Mesozoic Era, all of the continents were together in one land mass called Pangaea. This means some species of dinosaur existed millions of years apart! Not all dinosaurs lived throughout the entirety of the Mesozoic Era. Dinosaurs went extinct at the end of the Cretaceous period, though many scientists will argue that today’s birds are dinosaurs. This was when the Tyrannosaurus rex and the Triceratops lived. The Cretaceous period lasted from 145 to 65 million years ago. This was when species such as the Stegosaurus and the Brontosaurus lived. The Jurassic period occurred around 200 to 145 million years ago. The end of the Triassic period was when dinosaurs first started to appear.

Cretaceous (145 to 65 million years ago).

Jurassic (200 to 145 million years ago).

They lived during the Mesozoic Era, which can be broken down into three periods: A good example is the well-known Mosasaurus. Some early reptiles that lived in the Mesozoic Era are actually thought to be dinosaurs by many people. In fact, dinosaurs used to be categorized in the phylum Chordata which includes reptiles. They fall outside of the class Reptilia, but are considered to be reptiles ( or at least closely related) by many scientists They are not mammals, but they are closely related to birds and reptiles. This Kingdom includes humans, other mammals, birds, fish, bugs, reptiles, and many more. Like all animals, dinosaurs belong to the kingdom Animalia. Dinosaurs are very similar to many of today’s reptiles and birds.

Rhinoceros dinosaur