It's very sad when this happens...little things die...I suggest hanging wind chimes right outside the window or placing stickers or streamers inside the window...things that move but are foreign to birds so as not to 'attract them' but, rather, scare them away. It might help to note the natural habitat; what and where the birds tend to alite outside...and areas they seem to like...make your detractant the exact opposite (if possible) of those things. good luck. BTW, I'm doing wildlife rescue...nestlings, fledglings, and other injured birds and am learning so much about them...amazing facts I had no idea of...such as: The old wives' tale that you cannot touch a baby bird that has fallen from it's nest...to replace it very carefully back into the nest...because the parents will 'smell' your scent and abandon the baby bird....NOT TRUE....birds have no ability to smell....they don't have that sensory organ...how about that? Good Luck.