Wyvern

A new hostile mob idea: The Wyvern. A flying mob that only spawns in like higher up biomes. So, as in like, mountains, plateaus, and highlands. Completely Hostile on sight, however I imagine they wouldn't be as fast as phantoms, and they could hypothetically be outrun if someone doesn't have the equipment to fight one or just doesn't want to fight it. Only spawns at night of course. Basically, I imagine it being comparable to a flying zombie, but less zombie looking and more winged beast. Like a giant bat almost, but more dragon-like in flight and appearance. Similar to wyverns in mythology.