2 Two Favorite Dinosaurs

Topics: Dinosaur, Tyrannosaurus, Paleontology Pages: 2 (802 words) Published: March 4, 2010
Millions of years ago, long before there were any people, there were dinosaurs. Dinosaurs were reptiles that lived on Earth from about 225 to 65 million years ago. There were many different sizes and shapes of dinosaurs. Some were meat-eaters and some were plant-eaters. Some dinosaurs were very big and some were much smaller. {draw:frame}

A fossil is the remains or trace of something that was once alive, but is now long-gone and dead. We know that dinosaurs existed because of their fossil remains, mostly bones and shells that we have found. The dinosaurs (except the birds) went extinct, probably due to the after-effects of an asteroid which hit the Earth 65 million years ago. Its impact caused huge fires, volcanic activity, tsunamis, severe storms, highly acidic rain, chemical changes, global lowering of temperature which upset the entire food web. Plants died. The plant-eater dinosaurs would starve since the plants died. Then, meat-eater dinosaurs started to eat each other which led to extinction. The two dinosaurs I am going to choose for my project are Argentinosaurus and Stegosaurus. Although paleontologists claim to have found bigger dinosaurs, Argentinosaurus is the biggest sauropod whose size has been backed up by convincing evidence. This gigantic plant-muncher (named after Argentina, where its remains were found) measured about 120 feet from head to tail and may have weighed over 100 tons. Just one vertebra of Argentinosaurus is over four feet thick! I chose these two dinosaurs because they are my favorites. Argentinosaurus is the biggest dinosaur in the world! Stegosaurus was a pretty big dinosaur. But I find it very interesting and unbelievable that it had a tiny brain about the size of a walnut only! I wonder if human beings are going to extinct one day like the way Dinosaurs did. Here are 10 facts about this popular plant-eater with the spiked tail and plated back. 1. Stegosaurus had a brain the size of a walnut. - The...
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