'Amazing Dragon' Fossil Upends Origins of World's Largest Dinosaurs https://on.natgeo.com/2JQPINr via @NatGeoScience
so cool. It's all there - the idea that the lineage started out bipedal (which explains the trackways with young animals running on hindlegs!), the bone reabsorbtion/redistribution.
Have I mentioned just how awesome dinosaurs are?