Dinosaurs were of less weight than we normally think; Research

Berlin Brachiosaurus

Scientists have found through a new method of measurement that dinosaurs were thinner than we normally imagine.

This research has been done by scientists from The University of Manchester and published online in the journal Biology Letters.

[hana-code-insert name=’StumbleUpon’ /][hana-code-insert name=’Reddit’ /]Scientists used lasers to measure the minimum amount of skin used to wrap around the skeletons of modern day mammals such as polar bears, elephants and giraffes. They found that the animals had exactly 21% more body mass than the minimum skeletal ‘skin and bone’ wrap volume. They used this technique for giant Brachiosaur skeleton in Berlin’s Museum für Naturkunde.

Previously, the estimations of the weight of the Brachiosaur changes with maximum weight of 80 tonnes but now the team’s calculations have reduced the weight to about 23 tonnes. Scientists have reported that the same technique can be used for all types of dinosaurs.

Lead author Dr Bill Sellers from Manchester’s Faculty of Life Sciences said: “One of the most important things palaeobiologists need to know about fossilized animals is how much they weighed. This is surprisingly difficult, so we have been testing a new approach. We laser scanned various large mammal skeletons, including polar bear, giraffe and elephant, and calculated the minimum wrapping volume of the main skeletal sections.”

“We showed that the actual volume is reliably 21% more than this value, so we then laser scanned the Berlin Brachiosaur, Giraffatitan brancai, calculating the skin and bone wrapping volume and added 21%. We found that the giant herbivore weighed 23 tonnes, supporting the view that these animals were much lighter than traditionally thought.”

He said: “Volumetric methods are becoming more common as techniques for estimating the body masses of fossil vertebrates but they are often accused of excessive subjective input when estimating the thickness of missing soft tissue.”

“Here, we demonstrate an alternative approach where a minimum convex hull is derived mathematically from the point cloud generated by laser-scanning mounted skeletons. This has the advantage of requiring minimal user intervention and is therefore more objective and far quicker.”

“We tested this method on 14 large-bodied mammalian skeletons and demonstrated that it consistently underestimated body mass by 21%. We suggest that this is a robust method of estimating body mass where a mounted skeletal reconstruction is available and demonstrate its usage to predict the body mass of one of the largest, relatively complete sauropod dinosaurs, Giraffatitan brancai, as 23,200 kg.”

“The value we got for Giraffatitan is at the low range of previous estimates; although it is still huge, some of the enormous estimates of the past – 80 tonnes in 1962 – are exaggerated. Our method provides a much more accurate measure and shows dinosaurs, while still huge, are not as big as previously thought.”

Source: The University of Manchester


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