Two articles published in the journal “PeerJ” describe the discovery of two species of saber-toothed predators that were named Gorynychus masyutinae and Nochnitsa geminidens, both belonging to the group of therapsids. Christian Kammerer of the North Carolina Museum of Natural Sciences in Raleigh, USA, and Vladimir Masyutin of the Vyatka Paleontological Museum in Kirov, Russia, examined the fossils, which improve our knowledge of the evolution of early mammals.