Croc Ancestor 'Carolina Butcher' Ruled Before Dinos

TECH SPACE HUMAN EARTH HISTORY ANIMALS ADVENTURE VIDEO View Online Croc Ancestor 'Carolina Butcher' Ruled Before Dinos A tall, upright beast with slicing teeth was North America's top predator before the reign of dinosaurs. READ MORE Mars Is Wrapped in a Weird Dust Cloud A mysterious cloud of dust hundreds of miles above the Red Planet's surface was detected -- with no explanation for how it got there. READ MORE WATCH VIDEO: Did a Meteorite Finally Reveal Life on Mars? A rock from Mars may have contained water -- what are the implications? Solar Storm Leads to Stunning Aurora Displays: Photos A solar eruption was strong enough make the Aurora Borealis much more dramatic than usual. See photos from the show. READ MORE WATCH VIDEO: Auroras Are So Pretty! Lets Shoot Them! Why shoot rockets at auroras? For science!  How New Islands Bubble Into Being Landmasses gurgle up out of the ocean with surprising frequency. But how do these baby islands break the surface in the first place? WATCH Follow Discovery News on Facebook! Get your sci-tech headlines all day on Twitter too! At Discovery Communications, we value your privacy. If you would like to be removed from future communications like this, please click here. Privacy Policy Discovery Communications, LLC One Discovery Place Silver Spring, MD 20910 © Copyright 2015 Discovery Communications, LLC