This little guy is a key find in deciphering the evolutionary history of T-Rex.
http://blogs.discovermagazine.com/d-brief/2019/02/21/new-species-tyrannosaur-explains-rise-of-t-rex/?fbclid=IwAR2IfikpHR364crS2ac_J-72uNHVH6BTaoYXHH0LNmaOuom1ssWgTv9ygao#.XHHIG9F7nVp
