Wyverns are capable of running if they feel inclined to do so, yes, and they can do so relatively fast (around sixty km/h) while moving in a manner somewhat similar to that of a roadrunner (the actual bird), albeit with their wings not folded as tightly and slightly raised (they don't use their wings for anything besides maintaining balance when running). They are quite clumsy on the ground, though, and are liable to stumble or even fall over if trying to make an abrupt turn, and have great difficulty handling uneven terrain. At lower speeds - when walking or even just jogging - they are significantly more sure-footed and move with their body held more level, their heads lowered and tail raised, perhaps less reminiscent of predator birds like hawks and more of two-legged dinosaurs as they are usually depicted.