New theories reveal the ferocious T-Rex as… adorable?

The American Museum of Natural History presents the new, more accurate T. rex.

  • Hatchling, four-year-old, and adult models show us new sides of the famous predator.
  • They're part of the T. rex: The Ultimate Predator exhibit running from March 2019 to August 2020.
  • Attention time travelers: You may want to pet the feathered hatchling. Don't.

There's no doubt that the adult Tyrannosaurus Rex was a fearsome predator, with a powerful bite that could cause the head of a victim to explode from sheer force. Of course, much of what we've longed "known" about T. rex is informed speculation based on incomplete information. However, paleontologists at New York's American Museum of Natural History (AMNH) are about to unveil the result of a remarkable project.

They've constructed stunning models of the T. rex as a hatchling, as a four-year-old, and as an adult based on the latest discoveries and thinking. Their intent is to provide the most scientifically accurate renderings ever of the T. rex as part of their "T. rex: The Ultimate Predator"exhibit running from March 11, 2019 to August 9, 2020.

The biggest surprise? The hatchling. Who ever thought a T. rex could be so, well, crazy-cute!?

Latest fossil discoveries

Image source: AMNH/AMNH / R. Peterson

As more fossils are discovered, we learn more and more about the Tyrannosauroidea family. The first discovery of a feathered dinosaur, the Sinosauropteryx prima in 1996, suggested we might've been picturing the ancient creatures, including T. rex, incorrectly. More recent discoveries such as the Yutyrannus huali have only bolstered this suspicion. In addition, archeologists have begun finding infant Tyrannousaur fossils, and this has allowed the team at the AMNH, led by Mark Norell, to realistically imagine T. rex at three life stages for the "Ultimate Predator" exhibit.

Not all Tyrannosaurs were T. rexes — there were dozens of Tyrannosaur species, and no others were as large. The "Ultimate Predator" show includes a number of them, including the Dilong paradoxus. Most were about the size of a T. rex youngster as adults. They were all, however, all dangerous predators — and the AMNH exhibit will feature new representations of a variety of family members. Most Tyrannousaurs were fast runners, unlike the adolescent and adult T. rex, a slower-moving death machine. (The hatchling ran.)

Informed guesswork

There's still a fair amount of conjecture involved, but between what's visible in the fossil record and what can be seen today in T. rex's living relatives, there's little doubt that experts are growing ever-closer to a complete understanding of these creatures who last roamed the earth some 68 million years ago. A lot can be inferred from these familial connections, including feeding and parenting behaviors and various as-yet-unknown physical features. For example, fossilized T. rex footprints are nearly identical to the modern emu, albeit bigger, and so inferences can be made about their feet.

Speaking of skin, contrary to the traditional belief that T. rex's skin was akin to a contemporary lizard's or snake's, experts now suspect it was actually a more leathery covering, similar to that of the foot of a chicken or the leg of a turtle.

The new AMNH models reflect the latest theories regarding every minute details of their physiognomy.

The hatchling T. rex

Image source: AMNH/D. Finnin

About 60 percent of T. rex hatchlings — about the size of turkeys — probably didn't survive to their first birthday. The downy-feathered tykes grew quickly, though, about 140 pounds a month, but it still took until they were about 20 to reach full size. Experts believe that they were quick little predators with lots of tiny, needle-like teeth. Like modern Komodo dragons, they probably fed on insects and smaller vertebrates before maturing into their grownup fare.

The four-year-old T. rex

By the time T. rex was around four, it was as big as other non-rex Tyrannosaurs. (AMNH says this is about five times the size of a four-year-old human boy.) It was fully feathered, with teeth good for slicing and cutting as opposed to crushing, the speciality of the adult T. rex. At this stage, T. rex also had long arms — it's believed they stopped growing prior to reaching full size, resulting in the oddly teeny arms of the adult T. rex.

Adult T. rex

Even scarier than before? Image source: AMNH/D. Finnin

This is the terrifying bad boy — or girl — we know and fear, albeit likely with more feathers than you might have once thought. The monster was up to 40 feet long, and weighed between 11,000 and 15,500 pounds.

T. rex's banana-shaped teeth and mighty jaws could clamp down with 7,800 pounds of force — that's about the weight of three cars. It was one of very few creatures ever to be capable of pulverizing and digesting the solid bone of prey. (30–50 percent of T. rex coprolites, fossilized poop, is actually crushed bone.)

If that wasn't enough, we now know that T. rex senses were super-sharp. Orange-sized eyes faced forward, hawk-like, and were set far enough apart that T. rex had great depth vision. Examination of its brain casings suggests an exceptional sense of smell and of hearing, too.

The new exhibit has a shadow-theater floor projection of one of these nightmares coming to life.

The exhibit

If you're fortunate enough to visit the AMNH for the T. rex: The Ultimate Predator exhibit, you'll have the opportunity to get up close and personal — safely — with T. rex.

  • They'll have a definitive life-sized model of an adult T. rex, replete with patches of feathers.
  • There will be several hatchling reconstructions, as well as a four-year-old T. rex.
  • A "roar mixer" will allow visitors to construct their own T. rex roars by combining the vocalization of related animals.
  • You can wander through an interactive Cretaceous environment.
  • Dig in at a fossil "investigation station" with all the tools a paleontologist could want: a CT scanner, measuring tools, and a microscope.

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Scientists study tattooed corpses, find pigment in lymph nodes

It turns out, that tattoo ink can travel throughout your body and settle in lymph nodes.

17th August 1973: An American tattoo artist working on a client's shoulder. (Photo by F. Roy Kemp/BIPs/Getty Images)
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In the slightly macabre experiment to find out where tattoo ink travels to in the body, French and German researchers recently used synchrotron X-ray fluorescence in four "inked" human cadavers — as well as one without. The results of their 2017 study? Some of the tattoo ink apparently settled in lymph nodes.


Image from the study.

As the authors explain in the study — they hail from Ludwig Maximilian University of Munich, the European Synchrotron Radiation Facility, and the German Federal Institute for Risk Assessment — it would have been unethical to test this on live animals since those creatures would not be able to give permission to be tattooed.

Because of the prevalence of tattoos these days, the researchers wanted to find out if the ink could be harmful in some way.

"The increasing prevalence of tattoos provoked safety concerns with respect to particle distribution and effects inside the human body," they write.

It works like this: Since lymph nodes filter lymph, which is the fluid that carries white blood cells throughout the body in an effort to fight infections that are encountered, that is where some of the ink particles collect.

Image by authors of the study.

Titanium dioxide appears to be the thing that travels. It's a white tattoo ink pigment that's mixed with other colors all the time to control shades.

The study's authors will keep working on this in the meantime.

“In future experiments we will also look into the pigment and heavy metal burden of other, more distant internal organs and tissues in order to track any possible bio-distribution of tattoo ink ingredients throughout the body. The outcome of these investigations not only will be helpful in the assessment of the health risks associated with tattooing but also in the judgment of other exposures such as, e.g., the entrance of TiO2 nanoparticles present in cosmetics at the site of damaged skin."

Photo by Alina Grubnyak on Unsplash
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