AP - Even the powerful tyrannosaurs seem to have encountered a midlife crisis. Once they made it to about age 2 they could take on just about any other predator and had very little mortality until they reached sexual maturity in their teens, researchers report in Friday's issue of the journal Science.

AP - Even the powerful tyrannosaurs seem to have encountered a midlife crisis. Once they made it to about age 2 they could take on just about any other predator and had very little mortality until they reached sexual maturity in their teens, researchers report in Friday's issue of the journal Science.

Julie Farby - All Headline News Staff Writer Washington, DC (AHN)—The recent discovery of a furry, beaver-like animal that lived at the time of dinosaurs has overturned more than a century of scientific thinking about Jurassic mammals. Zhe-Xi Luo, curator of vertebrate paleontology at...

AP - Scientists say they've found the earliest known tyrannosaur, shedding light on the lineage that produced the fearsome Tyrannosaurus rex. The discovery comes with a puzzle: Why did this beast have a strange crest on its head?