In a 2013 research paper – A First Estimate for Canada of the Number of Birds Killed by Colliding with Building Windows – window collisions were ranked as the second-highest direct human cause of bird deaths in Canada, estimating that 16 million to 42 million (25 million mid-point) birds die from window collision annually in Canada.
Are there laws in Canada that protect birds? Yes, there are. And they include reflected light regulation.