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NOVA scienceNOW: T. rex

Program Overview


Scientists have gained new insights into the lifespan of Tyrannosaurus rex (T. rex) and how T. rex grew to be so large.

This NOVA scienceNOW segment:

  • reports that scientists typically find the age of dinosaurs and many other animals by counting growth rings in certain bones.

  • describes how Dr. Greg Erickson analyzed T. rex's bones and unexpectedly found distinct lines that appeared to be growth rings.

  • reveals how Erickson determined that T. rex grew from a 10-pound hatchling to a 12,000-pound giant over 20 years, with most of the growth occurring between the ages of 14 and 18.

  • concludes that 25 to 30 years old was considered old age for a T. rex.

Taping Rights: Can be used up to one year after the program is taped off the air.

Teacher's Guide
NOVA scienceNOW: T. rex
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