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  • They once romped and stomped all over the continents of Earth. The oldest lived 230 million years ago; they all died out about 65 million years ago. They thrived during the Triassic, Jurassic, and Cretaceous Periods. They were large—Brachiosaurus was up to 40 feet tall and 100 feet long; and small—Heterodontosaurus was about the size of a turkey.
  • With 48 fact-filled cards per package, Knowledge Cards are a great source of condensed information—all in a deck the size of a pack of playing cards.