Canada is home to millions of migrating birds that cross lakes and forests each spring to nest and reproduce before returning south in the fall. New research suggests migrating birds navigate using quantum effects to chart a course between their breeding and wintering grounds. But while millions fly to migrate, only a few survive the journey. <o:p></o:p>

An unintended but fatal flaw in the design of building glass has been contributing to the deaths of millions of birds in Canada and across North America, several years' worth of data compiled by advocates and reviewed by CTVNews.ca show. At least one estimate pegs the number of bird fatalities from window collisions at one billion each year across North America.

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Using reported bird deaths provided by Fatal Light Awareness Program (FLAP) Canada, a charity that has worked to raise awareness and address the issue of deadly collisions for about 30 years, CTVNews.ca was able to graph and map these fatalities, many of which include at-risk species. While navigating these routes is instinctive to birds, how they find their way has puzzled scientists for centuries.<o:p></o:p>