Byronosaurus jaffei

Named in 2000, this dinosaur is hot off the "paleo" presses! Unlike the jagged teeth of other troodontids, Byronosaurus has teeth with straight, sharp edges. About 80 million years ago, this swift, big-brained theropod hunted and ate small animals in Mongolia.

Image credits: main image, © AMNH; quote, Mark Norell courtesy of Discovery Channel Online.