Stupid pigs can levitate. How do I know? Well I got ambushed by some that jumped off a cliff onto me, so I grabbed my pteranodon once I respawned and flew over. I couldn’t find them so I dismounted to get my stuff just as the same pigs jumped off the same cliff that they had previously flew off and couldn’t get back up. I got my tapejara and flew back to find them again on top of the unclimbable cliff. I got them that time.
They appear in packs of three around the entire snow biomie.
Find an isolated pack away from wolfs, Carnos or Yutyrannus and pick the, of with a powerful gun, note that they don’t heal when at a decent range from the player, once they are about two strides from you they will start to heal themselves.