Scientists test dinos' sexual maturity
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Adolescent pregnancy isn't a modern invention, it occurred in dinosaurs millions of years ago. Medullary bone, a type of tissue present in modern birds when they are developing eggs, has been found in three dinosaur fossils, researchers report in Monday's online edition of Proceedings of the National Academy of Sciences.
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Contrary to the movie Jurassic Park, in which scientists recreate dinosaurs from ancient DNA, genetic material more than about 50 thousand years old cannot be reliably recovered.
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Researchers in China have unearthed the fossil remains of a parrotlike dinosaur surrounded by 34 juveniles. The find suggests dinosaurs were nurturing parents.
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At least 50 percent of the world's species, including the dinosaurs, went extinct 65 million years ago. While most scientists now blame this catastrophe on a large meteorite impact, others wonder if there is more to the story.
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Elated scientists on Wednesday showed off a 130-million-year-old fossil that casts mammals in a new light by proving that in prehistoric times they fed on young dinosaurs.
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Paleontologists say they have discovered the fossil remains of a duck-size dinosaur species, previously unknown to science, that died while catching some z's.
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Researchers use X-ray scanners to create 3-D models of prehistoric creatures preserved inside rocks.
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Male chimpanzees have evolved huge testicles and sperm counts for their body size. Among gorillas, females mate only with a dominant male, and accordingly, gorillas&#39; testicles are tiny.
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Scientists say they have found a small, earlier cousin of Tyrannosaurus rex that had at least a partial coat of feathers. Includes image gallery.
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From the sands of the Sahara, scientists have uncovered the bones of two new ferocious dinosaur predators - one that makes the kills and another that feasts on the leftovers.
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A new dinosaur species was a plant-eater with yard-long horns over its eyebrows, suggesting an evolutionary middle step between older dinosaurs with even larger horns and the small-horned creatures that followed, experts said.
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A fossil unearthed in China may provide a first look at dinosaurs&#39; bird-like sleep. Xu Xing, of the Chinese Academy of Sciences, and Mark Norell, of the American Museum of Natural History, said in a report
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Chinese and American scientists have discovered a fossil in northeast China which has provided a first look at dinosaurs&#39; bird-like sleep.
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Blog: Paleontologists have found that precursors to dinosaurs weren't so rapidly replaced as previously thought.
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The finding of a dinosaur fossil in southern China has given new clues to the evolution and hunting practices of a long-necked aquatic reptile that lived some 230 million years ago, the magazine Science said on Thursday.
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The dinosaurs might have gone out with a sudden bang, but their rise to dominance was a gradual ascent, experts say.
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Two previously unknown types of meat-eating dinosaur have been identified from Sahara desert fossils.