UEN Security Office
Technical Services Support Center (TSSC)
Eccles Broadcast Center
101 Wasatch Drive
Salt Lake City, UT 84112
(801) 585-6105 (fax)
Main Curriculum Tie:
Background For Teachers:
We know of over 300 kinds of dinosaurs, half of those from a single tooth or bone. A reliably new kind of dinosaur is found every seven weeks on average. There were probably thousands of kinds of dinosaurs, but most haven’t been found yet. We don’t get a great sample because fossils are usually only made in lowland areas where bones get covered over by mud, even though dinosaurs lived all over. And we only find fossils where rock from dinosaur times is now near the surface, and when the bones were preserved—many bones are weathered soon after the animal dies. Many places have dinosaurs but they are deep in the ground; in other places the weather wasn’t right to turn dinosaurs into fossils.
More species of plant-eating dinosaurs (herbivores) have been found
than carnivores, because there are always more herbivores than
carnivores in any animal population. One such plant eater was the
stegosaurus. The stegosaurus was a dinosaur that lived in Utah and
surrounding states. It weighed three tons, was nine feet tall and 15 feet
long. It had plates that it used for protection as well as to control body
temperature. The stegosaurus had a curved beak and very small teeth.
These teeth were too weak to chew food, so the plants were torn off by
the beak, swallowed in large pieces, and digested in the stomach.
Intended Learning Outcomes:
Invitation to Learn
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