Dinosaurs laying eggs caused their mass extinction millions of years ago, scientists have said, while live birthing mammals went on to thrive. The catastrophic event that wiped out all larger life forms some 65 million years ago meant the end for terrestrial dinosaurs. In a new explanation for mammals' evolutionary victory over dinosaurs, researchers said a mathematical model has shown that infant size was the clincher. Given physical limitations to egg size, dinosaurs had comparatively small young. Some came out of the egg weighing as little as two to 10 kilograms, yet had to bulk up to a hefty 30 or 50 tonnes.
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