A dinosaur that is new to science has features of both subfamilies of the tyrannosaur group, complicating our understanding of how they evolved https://www.newscientist.com/article/2594525-discovery-of-t-rexs-cousin-upends-our-understanding-of-tyrannosaur-evolution/?utm_term=Autofeed&utm_campaign=echobox&utm_medium=social&utm_source=Twitter#Echobox=1792422519