Jeff vandermeer - borne (HarperCollins Publishers)

A ruined city of the future lives in fear of a despotic, gigantic flying bear driven mad by the tortures inflicted on him by a mysterious biotech firm. A scavenger, Rachel, finds a creature entangled in his fur. She names it Borne. At first, Borne looks like nothing at all - a green lump that might be a discard. But nothing is quite the way it seems: not the past, not the present, not the future