Hell Chicken Discovery Could Tell Us Just How Doomed The Dinosaurs WereHell Chicken Discovery Could Tell Us Just How Doomed The Dinosaurs Were - ScienceAlert

Were dinosaurs already on their way out when an asteroid hit Earth 66 million years ago, ending the Cretaceous, the geologic period that started about 145 million years ago? It's a question that has vexed paleontologists like us for more than 40 years.