Cleaning Up Fish Farms
Got Milk? How?
Getting the dirt on carbon
Salamanders and Newts
Tree Frogs
Helping the Cause of Macaws
Lucky Survival for Black Cats
The Littlest Lemurs
Bringing fish back up to size
Surprise Visitor
Monkeys in the Mirror
Chemistry and Materials
The Taste of Bubbles
Diamond Glow
Mother-of-Pearl on Ice
A New Look at Saturn's rings
A Light Delay
Seen on the Science Fair Scene
Dinosaurs and Fossils
A Really Big (but Extinct) Rodent
South America's sticky tar pits
An Ancient Feathered Biplane
E Learning Jamaica
Results of GSAT are in schools this week
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
2014 GSAT Results for Jamaican Kids
Springing forward
A Volcano Wakes Up
Explorer of the Extreme Deep
Catching Some Rays
An Ocean View's Downside
Lessons from a Lonely Tortoise
Finding the Past
Writing on eggshells
Settling the Americas
Words of the Distant Past
Manta Rays
Food and Nutrition
Food for Life
Recipe for Health
Chew for Health
GSAT English Rules
Order of Adjectives
Subject and Verb Agreement
GSAT Exam Preparation Jamaica
Ministry of Education Announces 82 GSAT Scholarships for 2010
GSAT Practice Papers | GSAT Mathematics | Maths
Tarrant High overcoming the odds
GSAT Exams Jamaica Scholarships
GSAT Exam Preparation
42,000 students will sit for the GSAT Exam in two weeks
GSAT Scholarship
GSAT Mathematics
Monkeys Count
GSAT Practice Papers | GSAT Mathematics | Maths
Detecting True Art
Human Body
Prime Time for Broken Bones
Heavy Sleep
A Long Trek to Asia
Raise a Lifelong Reader by Reading Aloud
The Surprising Meaning and Benefits of Nursery Rhymes
Expert report highlights the importance to parents of reading to children!
The Mirror Universe of Antimatter
Dreams of Floating in Space
Extra Strings for New Sounds
Assembling the Tree of Life
Cactus Goo for Clean Water
Plants Travel Wind Highways
Copperhead Snakes
Boa Constrictors
Space and Astronomy
Saturn's Spongy Moon
The two faces of Mars
Planet Hunters Nab Three More
Technology and Engineering
Switchable Lenses Improve Vision
A Satellite of Your Own
Reach for the Sky
The Parts of Speech
Adjectives and Adverbs
Countable and Uncountable Nouns
Charged cars that would charge
Ready, unplug, drive
Revving Up Green Machines
Catching Some Rays
A Change in Climate
Recipe for a Hurricane
Add your Article

Ferocious Growth Spurts

Big dinosaurs were big eaters, especially in their teenage years. During adolescence, Tyrannosaurus rex and its relatives sometimes doubled their weight in just 4 years, according to new studies. T. rex was one of the biggest meat eaters ever to terrorize the planet. Adults could weigh more than 5,000 kilograms. Of course, the dinos weren't born that large, and scientists have long debated how quickly and when they grew to their adult size. To find out, paleobiologist Gregory M. Erickson of Florida State University in Tallahassee and his colleagues analyzed fossil bones from seven T. rex specimens. The species lived in North America between 68 million and 65 million years ago. The researchers were able to figure out how old the dinosaurs were when they died by counting yearly growth rings in the bones of the creatures. The smallest dino the team looked at weighed just 30 kilograms and was only 2 years old when it died. The largest, named Sue, weighed in at 5,650 kilograms. At 28, she was also the oldest. Other data showed that a T. rex's growth spurt usually began at about age 14. On average, the animal then gained 2 kilograms per day until around age 18. Analyses of three related species suggest that those dinosaurs also went through growth spurts at about the same time in their lives. Relying on other evidence, scientists suspect that an adult T. rex may have been too big to run and had to scavenge for its meals. It's possible the youngsters had a different feeding strategy and were able to scurry around, even to catch prey. Nonetheless, no matter how they did it, teenage tyrannosaurs certainly knew how to put on the pounds.E. Sohn

Ferocious Growth Spurts
Ferocious Growth Spurts

Designed and Powered by™