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Dinosaurs were fascinating creatures that roamed the Earth millions of years ago.

Here are some simple facts about dinosaurs:

1. Dinosaurs appeared around 230 million years ago during a time called the Mesozoic Era.

2. They were not all large! Some dinosaurs were as small as chickens.

3. Dinosaurs were divided into two main groups. One group had hips like birds, and the other group had hips like lizards.

4. Some dinosaurs were herbivores, which means they ate plants. Others were carnivores, which means they ate meat.

5. The largest known dinosaur is called Argentinosaurus. It could reach up to 100 feet long!

6. The smallest known dinosaur is called Archaeopteryx. It was about the size of a sparrow.

7. Dinosaurs went extinct about 65 million years ago, possibly due to a giant asteroid hitting the Earth or due to volcanic activity.

If you have a specific dinosaur or topic in mind that you want to learn about, just let me know!