According to a new theory dinosaurs may have become extinct because of how long it took for them to hatch. The study used fossilized dinosaur teeth from embryos to gage a time frame of six months, as opposed to other birds which lasts from 11-85 days. In order to acquire this number, scientists used CT scans of “von Ebner” line patterns on the fossilized teeth. These patterns are similar to tree rings and happen to be present in all animals. Due to this long incubation, the dinosaur eggs were exposed to predators and environmental disturbances and simultaneously was linked to their extinction.