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5 December 2013 11:26 am ,
Vol. 342 ,
An animal rights group known as the Nonhuman Rights Project filed lawsuits in three New York courts this week in an...
Researchers have been hot on the trail of the elusive Denisovans, a type of ancient human known only by their DNA and...
Thousands of scientists in the Russian Academy of Sciences (RAS) are about to lose their jobs as a result of the...
Dyslexia, a learning disability that hinders reading, hasn't been associated with deficits in vision, hearing, or...
Exotic, elusive, and dangerous, snakes have fascinated humankind for millennia. They can be hard to find, yet their...
Researchers have sequenced and analyzed the first two snake genomes, which represent two evolutionary extremes. The...
Snake venoms are remarkably complex mixtures that can stun or kill prey within minutes. But more and more researchers...
At age 30, Dutch biologist Freek Vonk has built up a respectable career as a snake scientist. But in his home country,...
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ScienceShot: Dino Twinkle Toes
5 June 2012 7:15 pm
A new method of estimating the weights of large-bodied animals hints that some dinosaurs may have been considerably lighter than scientists realized. When using the technique, researchers first use lasers to scan a skeleton of a large animal (example, left) and then software to estimate the minimum volume of tissue needed to fill the creature's body cavities and then cover its bones and skull. Next, the team adds an extra 21% to that volume, a correction factor that primarily includes limb muscles but also accounts for skin and surface flesh. (The 21% adjustment is derived from measurements of 14 living species of large-bodied mammals ranging in size from wild boar and caribou to giraffes and elephants and is remarkably consistent from one species to another, the researchers note.) Finally, multiplying the presumed volume of the creature by the average density of body tissue—another factor derived from modern-day mammals—provides an estimated weight, the researchers report online today in Biology Letters. When the technique was applied to the long-necked herbivore Giraffatitan brancai (3D model of skeleton, right), the team found that the dinosaur—one of the largest species yet known, reaching an estimated length of 26 meters—likely weighed just a little over 23 metric tons. That's hefty indeed, but it's nowhere near some of the previously reported weight estimates for the species, which range as high as 80 metric tons.
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