I had put my Wyvern in a cryopod and went down a beach side in Valguero, I forgot Pegomastax spawn there and I was harvesting some wood (Had my cryopod in my last item slot) I notice the Pegomastax it didn't click in to me what that was until after it took my cryopod I chased that Pego for a few minutes before I got killed by a Mammoth I accidentally hit. I never found that Pego again