A small, swift dinosaur, Oryctodromeus is the only ornithopod proven to have lived in burrows—that is, the adults of this genus dug deep holes in the forest floor, where they hid from predators and (probably) laid their eggs. Oddly enough, though, Oryctodromeus didn't have the type of elongated, specialized hands and arms one would expect in a digging animal; paleontologists speculate that it may have used its pointed snout as a supplementary tool. Another clue to the specialized lifestyle of Oryctodromeus is that this dinosaur's tail was relatively flexible compared to those of other ornithopods, so it could more easily have curled up in its underground burrows. You are searching for a bison on a buddy on a leaning tree.