After the update, certain dinosaurs and their spawn “habitat zones” changed. For example, Utahraptor is now a global anytime spawn, but Sarcosuchus is a local habitat zone 2 (L2) spawn. I agree with several of you that because of the changes, it’s become a little more challenging to find certain commons, but not impossible.
I’d recommend checking out MetaHub’s post about spawn rates after the 1.3 update. It has charts and everything to help remind players when and where certain creatures tend to spawn.