Despite their size, there is little doubt that even the largest teratorns could fly. Visible marks of the attachments of contour feathers can be seen on "Argentavis" wing bones. This defies some earlier theories that modern condors, swans, and bustards represent the size limit for flying birds. The wing loading of "Argentavis" was relatively low for its size, a bit more than a turkey's, and if there were any significant wind present, the bird could probably get airborne merely by spreading its wings, just like modern albatrosses. South America during the Miocene probably featured strong and steady westerly winds, as the Andes were still forming and not yet very high.