A newly discovered early relative of Tyrannosaurus rex was a fearsome predator in what's now southern Utah about 80 million years ago, according to a study. (seeker.com)
In lampreys, for example, certain parts of the brain and the mouth that distinguish the animals from earlier relatives begin a rapid decay within 24 hours. (sciencemag.org)
Fortunately, its survivors included early relatives of dinosaurs and mammals, as well as the ancestors of turtles, lizards and amphibians. (burkemuseum.org)