While searching through dinosaur fossil collections for another study on dinosaur bones with mammal tooth marks, Yale researcher Nick Longrich discovered a bone with especially large gouges in them.
Given the age and location of the fossil, the marks had to be made by T. rex, Longrich said. "They're the kind of marks that any big carnivore could have made, but T. rex was the only big carnivore in western North America 65 million years ago."
It was only after discovering the bite marks were from a T. rex that Longrich realized the bone itself also belonged to the behemoth. After searching through a few dozen T. rex bones from several different museum fossil collections, he discovered a total of three foot bones (including two toes) and one arm bone that showed evidence of T. rex cannibalism, representing a significant percentage.
"It's surprising how frequent it appears to have been," Longrich said. "We're not exactly sure what that means."
The marks are definitely the result of feeding, although scientists aren't sure whether they are the result of scavengers or the end result of fighting, Longrich said, adding that if two T. rex fought to the death, the victor might have made a meal out of his adversary. "Modern big carnivores do this all the time," he said. "It's a convenient way to take out the competition and get a bit of food at the same time."
However, the marks appear to have been made some time after death, Longrich said, meaning that if one dinosaur killed another, it might have eaten most of the meat off the more accessible parts of the carcass before returning to pick at the smaller foot and arm bones.
While only one other dinosaur species, Majungatholus, is known to have been a cannibal, Longrich said the practice was likely more common than we think and that closer examination of fossil bones could turn up more evidence that other species also preyed on one another.
The finding is a big clue into the obscure eating habits of these enormous predators. While today's large carnivores often hunt together in packs, T. rex likely acted on their own, Longrich said. "These animals were some of the largest terrestrial carnivores of all time, and the way they approached eating was fundamentally different from modern species," he said. "There's a big mystery around what and how they ate, and this research helps to uncover one piece of the puzzle."
Other authors of the paper include John Horner (Montana State University), Gregory Erickson (Florida State University) and Philip Currie (University of Alberta).
Suzanne Taylor Muzzin | EurekAlert!
Brought to light – chromobodies reveal changes in endogenous protein concentration in living cells
21.09.2018 | NMI Naturwissenschaftliches und Medizinisches Institut an der Universität Tübingen
A one-way street for salt
21.09.2018 | Julius-Maximilians-Universität Würzburg
The building blocks of matter in our universe were formed in the first 10 microseconds of its existence, according to the currently accepted scientific picture. After the Big Bang about 13.7 billion years ago, matter consisted mainly of quarks and gluons, two types of elementary particles whose interactions are governed by quantum chromodynamics (QCD), the theory of strong interaction. In the early universe, these particles moved (nearly) freely in a quark-gluon plasma.
This is a joint press release of University Muenster and Heidelberg as well as the GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt.
Then, in a phase transition, they combined and formed hadrons, among them the building blocks of atomic nuclei, protons and neutrons. In the current issue of...
Thin-film solar cells made of crystalline silicon are inexpensive and achieve efficiencies of a good 14 percent. However, they could do even better if their shiny surfaces reflected less light. A team led by Prof. Christiane Becker from the Helmholtz-Zentrum Berlin (HZB) has now patented a sophisticated new solution to this problem.
"It is not enough simply to bring more light into the cell," says Christiane Becker. Such surface structures can even ultimately reduce the efficiency by...
A study in the journal Bulletin of Marine Science describes a new, blood-red species of octocoral found in Panama. The species in the genus Thesea was discovered in the threatened low-light reef environment on Hannibal Bank, 60 kilometers off mainland Pacific Panama, by researchers at the Smithsonian Tropical Research Institute in Panama (STRI) and the Centro de Investigación en Ciencias del Mar y Limnología (CIMAR) at the University of Costa Rica.
Scientists established the new species, Thesea dalioi, by comparing its physical traits, such as branch thickness and the bright red colony color, with the...
Scientists have succeeded in observing the first long-distance transfer of information in a magnetic group of materials known as antiferromagnets.
An international team of researchers has mapped Nemo's genome, providing the research community with an invaluable resource to decode the response of fish to...
21.09.2018 | Event News
03.09.2018 | Event News
27.08.2018 | Event News
24.09.2018 | Physics and Astronomy
24.09.2018 | Information Technology
21.09.2018 | Physics and Astronomy