Something I was only vaguely aware of until I read this article, and something Torontonians can be proud of, is the city's bird friendly development guidelines, which consist of a number of simple suggestions builders and building managers can follow to cut down on the truly appalling number of birds killed each year (in the 100s of millions, continent-wide) by flying into glass fronted office towers.
A number of these suggestions can be applied at home as well. Back on the West coast we would lose a couple of hummingbirds a year, usually during mating season when they would get into fights around the feeders, until we took a little bit of white-tape and made a simple cross-hatched pattern with it on the outside of our kitchen windows. (You can also buy bird-shaped stick-ons, if you are worried about aesthetics. This way they don't mistake reflected trees for actual ones.
And the type of feeder that you suction-cup to your window also seems like a really bad idea.