Dinosaurs: New Findings & Theories

Sharon Hill

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Any truth to the idea I heard in passing that Tyrannosaurus Rex wasn't a fearsome hunter, but a carrion dinosaur, like a hyena or a vulture in these times?
That was Jack Horner's idea 20 years ago and it just doesn't stand up. It probably ate carrion if it came across it as it could intimidate anything else but plenty of evidence shows that it evolved for hunting and that it took down live animals. As this commentary shows, it was a false debate. No one really took it very seriously. https://www.nationalgeographic.com/...7/16/time-to-slay-the-t-rex-scavenger-debate/
 

GNC

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That was Jack Horner's idea 20 years ago and it just doesn't stand up. It probably ate carrion if it came across it as it could intimidate anything else but plenty of evidence shows that it evolved for hunting and that it took down live animals. As this commentary shows, it was a false debate. No one really took it very seriously. https://www.nationalgeographic.com/...7/16/time-to-slay-the-t-rex-scavenger-debate/
Thanks for the info! I suppose there must have been carrion dinos, but the T-Rex definitely wasn't one of them.
 

lordmongrove

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T.rex had an estimated top speed of 25 mph, good binocular vision and the most powerful bite force of any dinosaur. These are traits of a hunter.We know it left bite marks and tooth fragments in prey species that managed to escape and survive.
 

kamalktk

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Determining the body temperature of dinosaurs via the chemical composition of dino eggs.

https://phys.org/news/2020-02-dinosaur-parents-kids-fever.html

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To verify their hypothesis, Affek and her team needed to determine the environmental temperature in Alberta back when dinosaurs lived. They accomplished this by applying their isotope method to mollusk shells that lived in Alberta alongside the dinosaurs. Since mollusks are cold-blooded creatures, they reflect the ambient climate of the time. The mollusks' body temperature measured 26°C and showed that the dinosaurs living in Alberta were endothermic; otherwise, they could not have maintained a body temperature of 35-40°C.
 
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Determining the body temperature of dinosaurs via the chemical composition of dino eggs.

https://phys.org/news/2020-02-dinosaur-parents-kids-fever.html

-------------------------------------------
To verify their hypothesis, Affek and her team needed to determine the environmental temperature in Alberta back when dinosaurs lived. They accomplished this by applying their isotope method to mollusk shells that lived in Alberta alongside the dinosaurs. Since mollusks are cold-blooded creatures, they reflect the ambient climate of the time. The mollusks' body temperature measured 26°C and showed that the dinosaurs living in Alberta were endothermic; otherwise, they could not have maintained a body temperature of 35-40°C.

More on this hot stuff.

An analysis of fossil eggshells may have settled a long-running debate about dinosaurs, suggesting that all species were warm-blooded.

This also means the ancestors of dinosaurs must have been warm-blooded too, says Robin Dawson at Yale University, who led the research.

It is now mostly agreed that the feathered dinosaurs called theropods that gave rise to birds were warm-blooded, but there is still a debate about whether other groups of dinosaurs were too. Until recently, we had only indirect methods of working out the body temperature of ancient animals, so there was no way to be sure.

There is a way to work out the temperature at which organic matter forms inside bodies based on carbon and oxygen isotopes. This technique can be applied to eggshells to reveal the body temperature of the mother when the shells formed.

In 2015, researchers applied this method to the eggshell of a theropod and a sauropod – a long-necked dinosaur – and found both were warm-blooded. Now Dawson’s team has applied this method to three more fossil eggshells.

Read more: https://www.newscientist.com/articl...st-dinosaurs-were-warm-blooded/#ixzz6EDe1l2UK
 
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So it wasn't just dinos playing pranks.

The mystery surrounding dinosaur footprints on a cave ceiling in Central Queensland has been solved after more than a half a century.

University of Queensland paleontologist Dr. Anthony Romilio discovered pieces to a decades-old puzzle in an unusual place—a cupboard under the stairs of a suburban Sydney home.

"The town of Mount Morgan near Rockhampton has hundreds of fossil footprints and has the highest dinosaur track diversity for the entire eastern half of Australia," Dr. Romilio said.

"Earlier examinations of the ceiling footprints suggested some very curious dinosaur behavior; that a carnivorous theropod walked on all four legs. You don't assume T. rex used its arms to walk, and we didn't expect one of its earlier predatory relatives of 200 million years ago did either."

https://phys.org/news/2020-02-mystery-dinosaur-footprints-cave-ceiling.html
 
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Comfortably Numb

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Germany: Mini-dinosaur fossil discovery hailed as 'sensation'

Source: dw.com
Date: 21 February, 2020

The tiny skull of a miniature dinosaur has been discovered in Germany, scientists from the Stuttgart Natural History Museum announced on Thursday.

The fossil was found in a quarry in the town of Vellberg in the state of Baden-Wurttemberg, and belongs to a new type of dinosaur of around 10 centimeters (3.9 inches) in length. The creature is believed to have lived around 240 million years ago.

"It is a scientific sensation," said paleontologist Rainer Schoch. The miniature skull shows a great deal of similarities to modern-day lizards and snakes.

"The little animal is exciting, because we know so little about the ancestors of lizards and snakes," Schoch explained. "We have discovered a new species."

The "mini-dinosaur" has been given the scientific name Vellbergia bartholomaei, after the name of the town where it was discovered and the fossil collector Alfred Bartholomä.

The creature existed on earth around 20 million years before large dinosaurs evolved. The 12-millimeter long skull was examined under a tomograph to determine how the dinosaur ate and the size of its brain.

https://amp-dw-com.cdn.ampproject.o...ssil-discovery-hailed-as-sensation/a-52458554
 
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