2 Dinosaurs What do we know about them? Dinosaurs lived on earth more than 215 million years agoThey lived in most parts of the worldThey ruled the earth for nearly 150 million yearsDinosaurs have been extinct for 65 million yearsExtinct – something that once alive but no longer exist anywhere on the earth
3 How Do We Know About Dinosaurs? Paleontologist – scientist who studies fossilsFossil – what is left of a plant or animal that lived long agoDinosaur – animal that lived millions of years agoDinosaurs were not lizards or reptiles but many did lay eggs. Some had skin like crocodiles while others skin was much smoother.
4 How a Dinosaur Fossil is Made? Step 1:A dinosaur lives on Earth and roams the land.Step 2:A dinosaur dies and its body lays on the land.Step 3:Over time wind and rain help to cover the dinosaurs body with mud, sand, and leaves.Step 4:After millions of years the mud, sand, and leaves turn to rock. The bones or shape of the dinosaurs body are left in the rock and create a fossil.
5 How do Scientist Get Fossils? Paleontologist use special tools and chip fossils carefully from rocksThe fossils are then taken to a museum where they are cleaned, measured, and studied.Most fossils are found in piecesScientist try to put the fossil pieces together.Reconstruct – to rebuild or put together like puzzle pieces
6 What Have Scientist Learned From Dinosaur Fossils? There were different types of dinosaurs:Some were smallLike a chickenSome were tall3 story buildingSome were plant-eatersFlat teethSome were meat-eatersSharp teeth
7 More Dinosaurs Some walked on 4 legs Others walked on 2 legs Like animals todayOthers walked on 2 legsWith 2 short armsMany could fly like birdsOthers swam like alligators
8 Dinosaur Names Paleontologist give each dinosaur a name that best describes it. STEGASAURUS:Walked on 4 legsPlant-eater (flat teeth)Sharp plates on backSpikes on tail
9 Tyrannosaurus Rex Tyrannosaurus Rex means “lizard king” One of the fiercest of all dinosaursMeat-eaterAbout 12ft-16ft. TallWalked on 2 legs