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Dinosaurs are a diverse group of animals of the clade Dinosauria. They first appeared during the Triassic period, 231.4 million years ago, and were the dominant terrestrial vertebrates for 135 million years, from the start of the Jurassic (about 200 million years ago). The size of these animals is one of their most interesting aspects which will surely capture your students attention and engage their imagination.

Dinosaurs vs. Humans

This image shows the shadows of eight dinosaurs and a human. Invite your students to tell which ones were the tallest and the longest, estimate how big they were compared to a human.

Use this image when you teach sizes, have your students compare dinosaur sizes to everyday objects. In higher grades you might ask them to find out the exact height and length of different dinosaur species, and collect them in a table.

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