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New Analysis Shows Dinosaurs Not As Heavy As Previously Believed.
Cognitive Dissident writes "Discovery.com has an article on a new study using computer modeling to estimate the actual amount of flesh needed to cover the skeletons of dinosaurs. Based on a comparison with modern animals, it indicates that these animals could have weighed dramatically less than has been previously estimated. 'A huge Brachiosaur, once thought to weigh 176,370 pounds, is now believed to have weighed 50,706 pounds.' That's only about two-and-a-half times the weight of a modern African elephant. If other evidence can be reconciled with this, many estimates of the ecosystems dinosaurs lived in will also have to be revised."
Is enough known about footprint formation to estimate the mass of the creature that made them?
[Sorry if this is a repeat. I do not see my first attempt.]
Their they're doing there hair.
Interestingly enough 50,706 pounds is amlost exactly 23,000 Kg. Leading me to believe that the Kg was the original unit of the study
It's not ridiculous, because: A) reconstructing skeletons is challenging enough (look at the historical changes in understanding of the posture of dinosaur hips), B) reconstructing muscle mass, bone internal structure/density, lung volume, etc. is even more challenging, and C) the 80 tonnes estimate for Brachiosaurus was an upper limit, not the median estimate (which was closer to 40 or 50 tonnes). Being off by a factor of 2-3x is not ridiculous given the significant uncertainties, and you can't blame artists for it. They rendered the soft tissues of the models as specified by the scientists.
It took years before there was a better understanding of dinosaur anatomy. Take a look at reconstructions from the 1960s or 1970s versus more recent ones, and that explains most of the change. These "lighter dinosaur" models have been showing up in the last 10 years or so as 3D computer modeling techniques have improved (that 80 tonnes estimate is decades old), so this change isn't really news either. A few papers were already challenging the old numbers a few years ago. And if you fault the older estimates, well, you have to start with something. It's the normal process of refinement in science as techniques improve.