Flight

	Durzo was wearing a huge pack on his back that extended several feet above his shoulders-except it wasn't a pack.
	"Oh, hell no," Kylar said. "You cannot fly. Tell me you can't fly."
	Durzo shrugged. "Hollow bones, changes to the heart and eyes if you want to see while you dive, careful re-apportionment of body mass-it's a real bitch. Helps if you study dragons."

Beyond the Shadows, Chapter 93, pg. 636