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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Bones from the biggest dinosaur so far reported by scientists in Europe have been discovered in the Isle of Wight. A single neck bone from the 125 million to 130 million-year
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Scientists in China have found a 120 million-year-old fossil of a baby bird which is believed to have died just before it hatched and which could shed light on the relationship between dinosaurs and birds.
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Here's a dinosaur finding that parents can appreciate: The teenage Tyrannosaurus rex typically went through an explosive growth spurt, gaining nearly 5 pounds a day.
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NEW YORK  - A small study of female-to-male  transsexuals shows that testosterone therapy at "male" dosages  significantly increases bone mineral density.
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A form of intersex fish, which have both male and female traits, were found more often by researchers in areas with more farming and population density, according to a new study by the U.S. Geological Survey.
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before it hatched and which could shed light on the relationship between dinosaurs and birds. behaviour like caring for helpless young first began to evolve.
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CLEVELAND - 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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The fossils of six young dinosaurs found together in a ânurseryâ in northeast China show that these animals had started forming social groups much earlier than previously thought.
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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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Paleontologists have discovered a species of protorosaur, and they think the fossils hold the solution to the mystery of long-necked dinosaurs.
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Small, fast-moving carnivorous dinosaurs had air-sac respiratory systems similar to modern-day penguins and other diving birds, scientists reported on Wednesday.
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Teen sex, it turns out, is an issue at least as old as the dinosaurs.
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The bizarre-looking, 78-million-year-old dino had horns as large as human arms, and its skull was frilled with spikes the size of sharks' teeth.
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Scientists have uncovered the fossil skeleton of a robust bird-like dinosaur that lived 70 million years ago.
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In China, scientists have identified the fossilized remains of a tiny dinosaur in the stomach of a mammal. Scientists say the animal's last meal probably is the first proof that mammals hunted small dinosaurs some 130 million years ago.
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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.