I once had a perfect tame Reaper called 'Green Fury' and when my tribe mate quit and I couldn't take care of him anymore and it really sucked and I had to give him away.
I was taming a 145 blood wyvern and someone came over and attacked me with a club and gave me swamp sickness, so I raided his little thatch hut and made him watch me kill his only wyvern that he tamed die.