HOME >> BIOLOGY >> NEWS
T. rex owes its giant size to the ultimate teenage growth spurt

  • Field Museum scientist and colleagues chart first T. rex life history
  • Press conference Aug. 11 at noon to announce findings

    CHICAGO--For the first time, scientists have determined the lifelong growth pattern for the Tyrannosaurus rex. T. rex reached its massive adult size due to an extraordinary growth spurt that stretched from about 14 to 18 years of age. Furthermore, the surge was followed by about 10 years of little or no growth as an adult, according to a study that will be the cover story of Nature Thursday, Aug. 12, 2004.

    During the peak in its growth spurt, T. rex gained 2.1 kilograms (4.6 pounds) per day, developing into a more than 5,000-kilogram (11,000-pound) giant, one of the largest terrestrial carnivorous animals ever.

    "Knowing the lifeline is important because we now understand the evolution of T. rex's giantism, one of the most fascinating aspects of dinosaurs," said Peter Makovicky, PhD, Dinosaur Curator at The Field Museum and a coauthor of the study. "With the life history parameters, we can better understand T. rex evolution, biology, biomechanics and population dynamics."

    Makovicky and his colleagues determined T. rex's growth pattern and lifespan using an innovative technique that could be applied to many other dinosaurs. They determined the age by counting growth lines in T. rex bones and calculated the corresponding body size from circumference measurements of the femur. Correlating these two sets of data results in a growth curve.

    It has long been known that large weight-bearing dinosaur bones display growth lines, but they are hard to read. This is due to the way these large bones form: their marrow cavity expands and changes shape as they grow, erasing some of the internal lines.

    This study, however, focuses on smaller, nonweight-bearing dinosaur bones, including ribs, gastralia, and fibulas. These bones do not develop hollow cavities or remodel as they grow, so growth lines
    '"/>



  • Contact: Greg Borzo
    gborzo@fieldmuseum.org
    312-665-7106
    Field Museum
    11-Aug-2004


    Page: 1 2 3

    Related biology news :

    1. Growing pains: T. Rex was teenage giant
    2. Envisat fishes up facts behind Chilean giant squid invasion
    3. First view of giant crabs - at home on the slope
    4. Diet study focus of TAES research in effort to help save giant panda
    5. Best chance to protect giant pandas
    6. Dispatches and images available: Human impact on giant panda habitat
    7. University of Ulster spearheads giant leap forward in medicine
    8. Tropical glaciers formed while earth was giant snowball
    9. Discovery of tidal giant--a new Egyptian dinosaur--reported in Science
    10. Saving Floridas gentle giants
    11. Taking the pulse of giants: Detecting change and its consequences in western mountain ecosystems

    Post Your Comments:
    *Name:
    *Comment:
    *Email:


    (Date:1/20/2016)... -- A market that just keeps on growing. Molecular ... in genomics knowledge. Learn all about it in this ... dynamic trends are pushing market growth and company valuations. ... - pathogen evolution - next generation sequencing - emergence ... of the role of genetic material in Disease and ...
    (Date:1/15/2016)... JUAN, Puerto Rico , Jan. 15, 2016 /PRNewswire/ ... companies big and small to find new ways to ... driven culture. iOS and Android ... device based on biometrics, transforming it into a hardware ... request that users swipe their fingerprint on their KodeKey ...
    (Date:1/11/2016)... 11, 2016  higi, the leading retail and ... locations, web and mobile, today announced it has ... existing investors. --> ... further innovate higi,s health platform – its network ... – including expanding services and programs to retail ...
    Breaking Biology News(10 mins):
    (Date:2/10/2016)... ... February 10, 2016 , ... Benchmark ... today the promotion of two long-standing principal investigators (PI) to the roles of ... Research and Development. , Dr. Laurence Chu, a Benchmark Research PI in the ...
    (Date:2/10/2016)... Charlotte, NC (PRWEB) , ... February 10, 2016 ... ... highly anticipated expansion to their comprehensive training and support program, Sonalink™ remote monitoring. ... Sonablate® HIFU procedures performed on Friday, February 5th, connecting Dr. Samuel Peretsman to ...
    (Date:2/10/2016)... ... 2016 , ... Global Stem Cells Group, a ... Stem Cells Network (GSCN) and its affiliate Global Medical Training Network to ... and bone marrow therapies. , Through the new collaboration, Global Stem Cells ...
    (Date:2/9/2016)... ... 09, 2016 , ... With a presidential election in November and the future ... bring together over 500 top healthcare leaders for a night and day of debates ... by MBA students of the University of Pennsylvania’s Wharton School, will be held February ...
    Breaking Biology Technology:
    Cached News: