For a while I thought I was on to something with the wet thing, but I was wrong about even that. The whole "being wet makes them too heavy to fly properly" is more of an insect thing, since their wings are essentially thin pieces of exoskeletons and much more fragile due to insects being smaller creatures overall. Somehow I transplanted that vulnerability onto bird wings. In essence, Zero was kind of useless overall this time around. Oh well, it happens.