Birds from the Cretaceous period went out the same way as the dinosaurs…

For years, paleontologists have disagreed over whether birds from the Cretaceous period went out with a whimper — dying out gradually over the course of millions of years — or with a bang — getting wiped out by the same mass extinction event that is believed to have killed off Earth's most recent (and final) wave of… » 9/19/11 2:00pm 9/19/11 2:00pm