Learned this same lesson with my first fifth wheel. I have precut wire screens I made to fit that I install when we come home from camping trips.
Also, as weird as it may sound, I found that aftershave/cologne keeps birds away - apparently, they can't stand the smell. Had a bird that would perch on my ladder and hammer away at his reflection in the camper, so read online about the cologne and no more birds on my ladder. LOL
2014-3950, Full Paint, 17.5" tires, 370W solar, 3100W Magnum inverter w/ AGS, 7500w diesel generator, Micro-Air Easy Start 364 (x3)
2019 Ram 3500 Limited w/ Max Tow pkg