That's true and a very good point that has to be included in this discussion. However, Ducky is very young and very small so this flyer does imply flyers to be more dangerous than I granted them to be. I doubt that the same Pterosaur that caught her would have been a serious threat to one of her larger friends. I wonder how much of a threat even Pterano, Rinkus, and Sierra would be to Cera, Littlefoot, or Spike. They are larger of course but I could easily imagine Rinkus or Sierra being run over by Cera, Spike, or Littlefoot none of whom is as vulnerable as those flyers would probably be.