New research shows dinosaurs may have been smaller than we thought
FAIRFAX, Va., June 24, 2009 For millions of years, dinosaurs
have been considered the largest creatures ever to walk on land. While they still maintain this status, a new study suggests that some dinosaurs
may actually have weighed as little as half as much as previously thought.
In the stud...
Evidence of the 'Lost World' -- did dinosaurs survive the end Cretaceous extinctions?
The Lost World, Sir Arthur Conan Doyle's account of an isolated community of dinosaurs
that survived the catastrophic extinction event 65 million years ago, has no less appeal now than it did when it was written a century ago. Various Hollywood versions have tried to recreate the lost world of din...
Field Museum paleontologist leads study on two new dinosaurs from China
During the summers of 2006 and 2007, an international team of researchers from China and the United States excavated a treasure trove of dinosaur skeletons from Early Cretaceous rocks in the southern part of the Gobi Desert near the ancient Silk Road city of Jiayuguan, Gansu Province, China. Two o...
Young dinosaurs roamed together, died together
A herd of young birdlike dinosaurs
met their death on the muddy margins of a lake some 90 million years ago, according to a team of Chinese and American paleontologists that excavated the site in the Gobi Desert in western Inner Mongolia.
The Sudden sudden death of the herd in a mud trap provid...
'Fattysaurus' or 'thinnysaurus'? How dinosaurs measure up with laser imaging
Karl Bates and his colleagues in the palaeontology and biomechanics research group have reconstructed the bodies of five dinosaurs, two T. rex (Stan at the Manchester Museum and the Museum of the Rockies cast MOR555), an Acrocanthosaurus atokensis , a Strutiomimum sedens and an Edmontosaurus...
Male dinosaurs may have been prehistoric babysitters, study shows
COLLEGE STATION, Dec 18, 2008 Those ferocious Hollywood meat-eating dinosaurs
you're used to seeing in the movies very possibly had a much softer side: the males might even have been sort of prehistoric babysitters, according to a far-flung study conducted by a Texas A&M University researcher.
CT scans reveal that dinosaurs were airheads
ATHENS, Ohio (Dec. 8, 2008) Paleontologists have long known that dinosaurs
had tiny brains, but they had no idea the beasts were such airheads.
A new study by Ohio University researchers Lawrence Witmer and Ryan Ridgely found that dinosaurs
had more air cavities in their heads than expected. ...
Study of polar dinosaur migration questions whether dinosaurs were truly the first great migrators
EdmontonContrary to popular belief, polar dinosaurs
may not have traveled nearly as far as originally thought when making their bi-annual migration.
University of Alberta researchers Phil Bell and Eric Snively have suggested that while some dinosaurs
may have migrated during the winter season, ...
Princeton geoscientist offers new evidence that meteorite did not wipe out dinosaurs
A Princeton University geoscientist who has stirred controversy with her studies challenging a popular theory that an asteroid wiped out the dinosaurs
has compiled powerful new evidence asserting her position.
Gerta Keller, whose studies of rock formations at many sites in the United States, Me...
Mass extinctions and the evolution of dinosaurs
Reporting in Biology Letters, Steve Brusatte, Professor Michael Benton, and colleagues at the University of Bristol show that dinosaurs
did not proliferate immediately after they originated, but that their rise was a slow and complicated event, and driven by two mass extinctions.
"The sheer ...
Despite their heft, many dinosaurs had surprisingly tiny genomes
They might be giants, but many dinosaurs
apparently had genomes no larger than that of a modern hummingbird.
So say scientists who've linked bone cell and genome size among living species and then used that new understanding to gauge the genome sizes of 31 species of extinct dinosaurs
and birds, ...
Large dinosaurs were extremely hot in their day, UF study finds
If you think dinosaurs
are hot today, just think back to about 110 million years ago when they really ran hot and heavy.
One of the larger animals, a behemoth called Sauroposeidon proteles, weighed close to 120,000 pounds as an adult. Now, a new study led by the University of Florida suggests it...
Did feathered dinosaurs exist?
New evidence raises questions about current theoryBiologists examining evidence for the claim that birds evolved from dinosaurs
have reached some surprising new conclusions. However, they caution that "the problem of avian origins is far from being resolved." Their analysis is published online Octo...
Study: Predatory dinosaurs had bird-like pulmonary system
What could the fierce dinosaur T. rex and a modern songbird such as the sparrow possibly have in common? Their pulmonary systems may have been more similar than scientists previously thought, according to new research from Ohio University and Harvard University.
Though some scientists have propos...
Surviving mass extinction by leading a double life
It had been thought that all modern planktic foraminifers were descended from the few lucky survivors of the meteor impact that wiped out the dinosaurs
and 65 to 70 per cent of life on earth 65 million years ago. However, this might not be the case.
Dr Wade together with PhD student Heidi Seears ha...
Down Under dinosaur burrow discovery provides climate change clues
..., suggests that burrowing behaviors were shared by dinosaurs
of different species, in different hemispheres, an...s of years during the Cretaceous Period, when some dinosaurs
lived in polar environments.
"This research help...ung in their dens, burrowing may have allowed some dinosaurs
to survive extreme environments throwing a wrench...
...d to calculate dinosaur mass is flawed, suggesting dinosaurs
have been oversized.
Widely cited estimates for ...statistical model to estimate body weight of giant dinosaurs
and other extraordinarily large animals in extinct...tical model is seriously flawed and that the giant dinosaurs
probably were only about half as heavy as is gener...
Beaked, bird-like dinosaur tells story of finger evolution
...y say, demonstrates that theropod, or bird-footed, dinosaurs
were more ecologically diverse in the Jurassic per... edition of the journal Nature .
"This work on dinosaurs
provides a whole new perspective on the evolution ...eropod dinosaur descendants. The hands of theropod dinosaurs
suggest that the outer two fingers were lost durin...
Sands of Gobi Desert yield new species of nut-cracking dinosaur
...n the skull to that in parrots, the descendants of dinosaurs
most famous for their nut-cracking habits, is rema...remains to be seen whether some other plant-eating dinosaurs
or other reptiles had the same mechanism."
Th...how the same sliding wear patterns as plant-eating dinosaurs
with flexible skulls.
Discovery raises new doubts about dinosaur-bird links
...ds are found earlier in the fossil record than the dinosaurs
they are supposed to have descended from," Ruben s...ts kept pointing to birds as having descended from dinosaurs
was similarities in their lungs," Ruben said. "However, theropod dinosaurs
had a moving femur and therefore could not have ha...
New book suggests Earth perhaps not such a benevolent mother after all
...Gaia," he said.
He notes that of 15 mass extinction events in Earth's history, only the one 65 million years ago that brought an end to the age of dinosaurs
was likely caused by a comet or asteroid crashing into the planet's surface. The others all resulted from Earth's own processes.
"There's no Gaia....
New dinosaur species possible in Northwestern Alberta
...g site and found the remains of baby, plant-eating dinosaurs
and the teeth of a predator. The researchers match...n this part of the continent: "It established that dinosaurs
were nesting at this high latitude," said Miyashit...to this there were no localities with a variety of dinosaurs
and other animals between Alaska and southern Albe...
How Volvox got its groove
...olony at least 200 million years ago, during the Triassic Period.
At that time, Earth was a hot-house world whose inhabitants included tree ferns, dinosaurs
and early mammals. Previous estimates had suggested Volvox 's ancestors arose only 50 million years ago.
The algae switched to a communal lifesty...
Darwin's seminal impact on biology, anthropology, philosophy and psychology
...rated that human beings are the result of chance. We could have been radically different or not even exist. The world could have remained populated by dinosaurs
or bacteria. Natural selection has no precise objective. If we are here it's because our ancestors were lucky," explains Bouchard.
The notion of su...
World's largest snake discovered in fossilized rainforest
...as it is now called, is the largest snake ever known, and was the largest non-marine vertebrate from the epoch immediately following the extinction of dinosaurs
65 million years ago. "The discovery of Titanoboa challenges our understanding of past climates and environments, as well as the biological limitati...
Dinosaur fossils fit perfectly into the evolutionary tree of life
...und that scientists' knowledge of the evolution of dinosaurs
is remarkably complete.
Evolutionary biologist...e researchers found that the fossil record for the dinosaurs
studied, ranging from gigantic sauropods to two-le...e've shown in this study is that the agreement for dinosaurs
is remarkably good, meaning that we can have faith...
A case of mistaken dino-identity
...quate study of the sauropod bones found at the Glen Rose site. Jacobs has described Texas as a kind of "free trade zone for the age of reptiles" since dinosaurs
from three different geologic time periods have been found in three different geographic areas of the state. Paluxysaurus jonesi is believed to have...
Italy's geologic history becomes a personal tale in Walter Alvarez's new book
...years ago at the boundary between the Cretaceous and Tertiary periods, when dinosaurs
and many other creatures died out. But Alvarez also takes readers along the...which ... was an outrageously unlikely event that, had it not occurred, the dinosaurs
would still be around and there wouldn't have been any human beings."
'A dinosaur dance floor'
...eatures. The study argues the impressions are from dinosaurs
They are the correct size for tracks... the west-southwest. Seiler says the direction the dinosaurs
walked "either was dictated by the large dunes tha... are believed to have been made by upright-walking dinosaurs
16 to 20 feet long, or smaller than Tyrannosaurus ...
Geologist who linked cosmic strike to dinosaurs' extinction takes top prize
...Walter Alvarez, the maverick geologist who convinced a skeptical world that dinosaurs
and many other living things on Earth were wiped out by a huge fireball fro.... The seemingly instant extinction dated to 65 million yearsaround the time dinosaurs
died out. Together with his father--the Nobel-winning physicist Luis Alvare...
Key to function of dinosaur crests found in brain structure
...range, bony crests on the heads of the duck-billed dinosaurs
known as lambeosaurs. The structures contain incre...reconstruction techniques to show that duck-billed dinosaurs
likely communicated via sound and signal, " said A...mented a delicate inner ear that confirms that the dinosaurs
could hear the low-frequency calls produced by the...
Brain structure provides key to unraveling function of bizarre dinosaur crests
...range, bony crests on the heads of the duck-billed dinosaurs
known as lambeosaurs. The structures contain incre...mented a delicate inner ear that confirms that the dinosaurs
could hear the low-frequency calls produced by the...dicine. "We suspected that the crested duck-billed dinosaurs
used both vocal and visual displays, but now we se...
A new dinosaur species, Pachyrhinosaur lakustai, unveiled from Pipestone Creek, Alberta, Canada
... The fossils revealed a herd of dinosaurs
that perished in a catastrophic event 72.5 million years ago. The animals are characterized by a bony frill on the back of the skull ornamented with s...
New meat-eating dinosaur from Argentina had bird-like breathing system
...t looks like the beast had a system of air tubes under its skin," he said.
The team highlighted three explanations for the evolution of air sacs in dinosaurs
in their paper: development of a more efficient lung; reduction of upper body mass in tipsy two-legged runners; and release of excess body heat.
Meat-eating dinosaur from Argentina had bird-like breathing system
...-filled bones are the hallmark of the bellows system of breathing in birds and also are found in sauropods, the long-necked, long-tailed, plant-eating dinosaurs
that Wilson studies.
"In sauropods, pneumaticity was key to the evolution of large body size and long necks; in birds it was key to the evolution of...
America's smallest dinosaur uncovered
...o another dinosaur species.
"This is the oldest and most complete dinosaur of its kind known from North America and it provides evidence that these dinosaurs
migrated to Asia through North America," he said.
Longrich, who specializes in studying dinosaur-era ancestors of birds, completed his PhD at the U...
Ancient mother spawns new insight on reptile reproduction
...ed 26 eggs, each approximately 4 cm in diameter.
Both specimens belong to an extinct turtle called Adocus, a large river turtle that lived with the dinosaurs
and resembles today's slider and cooter turtles.
The eggs of Adocus are extremely thick and hard, whereas those of most modern turtles are either t...
Dying frogs sign of a biodiversity crisis
...d David Wake, professor of integrative biology at UC Berkeley. "Amphibians have been around for about 250 million years. They made it through when the dinosaurs
didn't. The fact that they're cutting out now should be a lesson for us."
The study, co-authored by Wake and Vance Vredenburg, research associate a...
Academy publishes first biography of artist-naturalist Benjamin Waterhouse Hawkins
... on to make the first life-size reconstructions of dinosaurs
and other prehistoric creatures anywhere in the wo...ones" points out that the articulated skeletons of dinosaurs
and life-size models of how they may once have app...uch things in the second half of the 19th century, dinosaurs
and their kin were little known, poorly understood...
The mystery of mass extinctions is no longer murky
...ut Earth's periodic mass extinction events such as the sudden demise of the dinosaurs
65 million years ago, you might consider crashing asteroids and sky-darkeni...he dinosaurs, scientists have a smoking gun, an impact crater that suggests dinosaurs
were wiped out as the result of a large asteroid crashing into the planet. ...