id go with ferrets cuz there are only 2 dark kebbits to catch. with ferrets, u only release the ferret, with kebbits u bury the bones and drop the hide. slows u down alot.... but, to throw another in the mix, dont forget those salamanders(lvl 47), they are super fast xp, but u need a rope and a fishing net to catch them. and when your net fails, u have to pick up both of them.