Fossil egg study suggests dinosaurs were already in decline when asteroid struck

Fossil egg study suggests dinosaurs were already in decline when asteroid struck

Sign up for CNN's Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. (CNN)It's a hard-fought paleontological debate. Did the massive asteroid that struck Earth 66 million years ago wipe out a thriving and diverse population of dinosaurs, or were they already struggling to survive when that cataclysmic day dawned? Most information on dinosaurs at the end of the Cretaceous era comes from what is now the United States, particularly the Hell Creek …