Quick facts about dinosaurs
Where they lived: Dinosaur fossils have been found on every continent, including Antarctica.
What they ate: Some ate plants, while others ate animals, including other dinosaurs.
How big they were: The smallest dinosaurs were the same size as hummingbirds at only 2 inches (5 centimeters) long, while the longest reached over 120 feet (37 meters) in length.
Dinosaurs are the extinct relatives of birds that roamed the lands and seas of ancient Earth. They first appeared around 240 million to 230 million years ago in the Triassic Period, and went extinct around 66 million years ago, at the end of the Cretaceous Period, when a massive asteroid slammed into Earth.
