Birds tapping at rear RV windows . . . advise please.

We had this problem once. We didn't want to block out the whole window so we got a large black trash bag and cut it in strips along the long side, leaving the long edge in tact. Taped it up and no more birds. The strips blew in the breeze which helped, too. It was odd that it only tapped on one particular window, not all of them. Good luck!