Let me just say, the only flyers that can easily outrun and out tank one of these is another wyvern. When you run, do NOT fly straight ahead. They are faster and stronger than you and don’t run out of stamina. I highly suggest stealing any wyvern egg that you can find, and then use that wyvern to go egg hunting instead.

Use a ptero or moth with lvls pumped into speed, stam and health and use that to at least get you to an egg.

Having your bird die over a body of water, or even dismounting into the water can be a potential lifesaver, too.

Good luck!