How Old Were the Oldest Dinosaurs?
From research, paleontologists have determined that the T. Rex grew very fast and reached adulthood around age 20.
CREDIT: Nobumichi Tamura / Natural History Museum.
Dinosaurs are keeping mum on exactly how many birthdays they celebrated back in the day.
But scientists have come up with clever ways to guess the lifespans of the ancient reptiles.
To determine how long and how fast Tyrannosaurus rex grew, paleontologist Mark Norell at the American Museum of Natural History and colleagues counted rings in some of the dinosaurs' ancient bones. Similar to tree rings, each ring in a dinosaur bone marks another year of growth.
“We found on the basis of seven specimens that T. rex reached adult size at 19 years of age,” said Norell. “The oldest T. rex that we could find was the specimen named Sue at the Field Museum in Chicago, which was 28 years old. T. rex grew very fast — for a four-year stint, it was putting on more than 5 pounds per day.”
Life's Little Mysteries: Gift Edition Hardcover Book
Uncover the truth behind more than 100 mysteries that surround us every day with our new hardcover book! Perfect for gifts and classrooms, and suitable for all ages. Some of the included mysteries are:
- Why Do Cats Land on Their Feet?
- How Long Does it Take to Make Petrified Wood?
- What Everyday Things Around Us Are Radioactive?
Find out all of this and much, much more in our NEW hardcover book.
It makes a great gift idea for all ages. more info>>