A Picture of Allosaurus Fragilis

Allosaurus Facts

  • Species Type: Allosaurus Fragilis
  • Type of Dinosaur: Theropod
  • Period: Late Jurassic
  • Diet: Meat (carnivorous)
  • Life Span: 25 to 30 years
  • Length: 28 feet on average
  • Weight: 2,200 pounds on average

15 Allosaurus Facts for Kids

  1. The Allosaurus was discovered in 1877 by Othniel Charles Marsh in Colorado.
  2. The Allosaurus got its scientific name Allosaurus Fragilis in 1877 from Othniel Charles Marsh.
  3. The name Allosaurus means: Different Lizard.
  4. The name Allosaurus is pronounced: “AL-uh-SAWR-us”.
  5. The Allosaurus was part of a group of dinosaurs known as Theropods.
  6. They lived in the Late Jurassic Period between 150 to 155 million years ago.
  7. Estimates put the average length of an Allosaurus around 28 feet.
  8. Estimates put the average weight of an Allosauruses around 2,200 pounds.
  9. Paleontologists believe an Allosaurus was fully grown and reached sex maturity around the age of 15.
  10. The Allosaurus was an active carnivore and paleontologists believe they would hunt large sauropods in groups.
  11. The teeth from Allosaurus fossil specimens are on average three to four inches in length.
  12. Based on fossil specimens’ paleontologists believe the Allosaurus may have frequently attacked Stegosaurus. A vertebra from an Allosaurus had damage from what appeared to be a Stegosaurus tail. A Stegosaurus neck bone had a bit mark that matched the Allosaurus bite mark.
  13. A 95% complete Allosaurs fossil specimen called Big Al was discovered near Shell, Wyoming, in 1991. In 1996, the same team that discovered Big Al unearthed another Allosaurs fossil specimen called Big Al Two. This one was even more complete that Big Al.
  14. The Allosaurus was the first dinosaur to ever appear in a movie. The 1925 film The Lost World stared an Allosaurus.
  15. In 1988, the State of Utah officially designated the Allosaurus as the official state fossil.

Additional Resources on Allosaurus