my friend Daystrom had a big tree in front of his house with a hummingbird nest. From his balcony you could look right into the net. It was so cool! Sadly, they cut the tree down because the people living further downstairs complained that they had no light (if I lived in LA I'd be happy to have shade! It's unbelievably hot there)
Interestingly, no hummingbird ever flew into his window. And come to think of it, I've never heard of a hummingbird ever having such an accident. Could it be that hummingbirds are smarter than other birds? Or do they just react quicker?