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Dinosaur eggs reveal one possible reason why they went extinct
The eggs of some dinosaurs took much, much longer to hatch than the eggs of their avian relatives and descendants -- and it could have contributed to their demise. A team of researchers from various institutions examined the embryonic tooth from a soccer-ball-sized egg. It was laid by a 30-foot-long duck-billed non-avian dinosaur called Hypacrosaurus that's closely related to reptiles like crocodiles. By calculating the daily growth markers in the teeth, they discovered that the animal's eggs take around six months to hatch. It's also likely that the bigger the egg, the longer the incubation time. In comparison, ostrich chicks burst out of their shells after only 42 days, and smaller birds have even shorter incubation periods.
