The popular image of dinosaurs is that of giant lizards. After all, that's where their name came from. Science, however, paints us a different and more complicated story. They were warm-blooded, unlike reptiles and some were actually closer to birds than lizards, having feathers and wings. There were, however, nonavian dinosaurs that were indeed closer to crocodiles than chicken. And these, according to scientists, laid eggs that took 6 months or more to hatch, which, in a sad way, helped bring about their extinction.