I knew! They are like that from birth!
My son just picked up a plane. Well, how to gather... In general, he has a corn-plane designer - wings, fuselage, chassis, tail, propeller. And all this on the wings.
So he gathered everything well and forgot his wings. I told him that he would not fly. I thought, went to myself.
He returned and joyfully showed his "miracle" - one wing on top, only up with his legs, and the other under his stomach.
But! The main! How reliably and carefully wrapped with scotch))