You can participate in The University of Alberta Birds and Windows Project, which uses citizen science to identify the factors that affect collision risk at residential homes. Participants regularly search around their residence for evidence of bird window collisions and record bird window collisions using an online survey. To sign up (and read advice about preventing bird collisions) see http://birdswindows.biology.ualberta.ca/
It has been estimated up to 1 billion birds are killed in North America each year as a result of bird window collisions! This is one of the largest threats facing urban bird populations. Residential homes are estimated to represent 90% of building-related mortality, directly related to their large number compared to other building classes. However, more work is needed; only four studies in the past have focused on bird window collision mortality at houses.