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The world's oldest dinosaur eggs are helping us understand how baby dinosaurs grew. New high-powered scans of an early dinosaur species' fossilised eggs are showing for the first time how the animals' teeth developed while still inside the egg.
Until the 1980s, discoveries of fossilized eggs and bones of young dinosaurs were extremely rare, but dinosaur eggs have now been discovered on several continents, and fossils of hatchlings, juveniles, and adults have been found for most major groups.
The new evidence that some dinosaurs and their extinct reptilian contemporaries laid eggs without hard shells helps explain the rarity of eggs in the first half of the fossil record,...
The eggs, nests and embryos inspired an entirely new field of investigation, providing insights into dinosaur reproduction, physiology, metabolism and behaviour.
Five images display (A) an unhatched egg, (B) a circular outline of a possibly unhatched egg, (C) a compressed egg showing hatching window (arrow) and eggshells collected around the hatching ...
The eggs of Mussaurus, a dinosaur that lived more than 200 million years ago, had soft shells. Traces of a soft shell are visible here as the black egg-shaped halo surrounding the dinosaur...
In 1995, paleontologists working in the Gobi Desert of Mongolia found this clutch of fossilized Protoceratops eggs and embryos, the first eggs of a horned dinosaur ever described.
Scientists used powerful X-ray beams to probe the interior of fossil dinosaur eggs, capturing highly detailed images of embryos belonging to Massospondylus carinatus, a herbivorous dinosaur...
A fossil egg unearthed from Cretaceous deposits in Antarctica is more than 20 cm long, exceeds all known nonavian eggs in volume, is soft-shelled, and was perhaps laid by a giant marine...
The baby dinosaur seemed almost ready to burst free from its shell, curled up so tightly its head tucked between its toes. But an unknown event buried the egg before the small creature ever...