https://en.m.wikipedia.org/wiki/Inostrancevia

https://www.smithsonianmag.com/smart-news/during-the-great-dying-this-saber-toothed-predator-reigned-180982236/

Inostrancevia was a type of synapsid called a gorgonopsian—a group of saber-toothed beasts. It was about the size of a tiger but vaguely reptilian in appearance, with leathery skin like a rhinoceros.