Dinosaur Doom Almost Wiped Birds Out, Too

It's the most common caveat you'll hear about the End-Cretaceous mass extinction: It wiped out the dinosaurs, except for birds which are, you know, dinosaurs. A new study suggests that the global die-off nearly took birds out as well.About 66 million years ago, a mass extinction offed a huge percentage of life on Earth — about three-quarters of all species that had been going about their business. Researchers still debate whether an asteroid or massive volcanic activity was