The creatures are unable to jump up 1 block, resulting in them always becoming stuck in a ditch or low area of their enclosures. Some creatures seem to do just fine going uphill (Diplodocus, Citipati, Elasmotherium), but I have a Therizinosaurus, Dryosaurus, and Triceratops that all struggle to go up 1 block changes in elevation.

It seems very inconsistent, sometimes the creatures can do it, other times (when set to "follow") they get stuck and try to move in my direction but are unable to.